The possibility for game updates, where for example, a huge one, 'Get Famous' we can become a Director/Producer or work with them that we meet and make our own TV show or Movie or Commerical that shows up on TV? Minor detail would make a huge difference. The same thing with traveling, I feel like having a holiday pack would be interesting, where you could go to a cast-away place, or travel long distances where there's a random instance that loads, and if you are a certain occult or have the skills and dive and explore more of the world. And each place traveled to you can only learn a skill at those locations like a certain dance, craft, martial art, or yodeling- something unique, adding in a new feature like Motels/Hotels where it's a temporary cheap or expensive stay, bringing back usable vending machines back, then adding a supernatural danger like 'The Hitchhiker' or Zombies. And while traveling in a vehicle (which would appear on the map instead of Devs allowing Sims to actually drive all the cars we see in Cities, Towns, Valleys, and Beaches- anyway, just a thought) you have to have a certain handiness skill to fix it, or you have to explore for help avoiding any ghouls, werewolves, zombies, vampires- or any expansion pack people have enabled, is how hard it will be to escape. This unlocks the class of 'Hunters' where you can hunt animals with traps, or supernatural beings- giving buffs to gardening and fishing. And adding to the Outdoor Living pack where you could set up camp anywhere with space on the map for the evening when you're exploring. And if there is a mountain, adds use for Rock Climbing, and if there is a snow slope, adds use for skiing other than the locations of where we got these options. Kind of like a workhorse pack, the ability to explore and use any and all packs we have to explore as a Backpacking Holiday pack.
And if we can't drive cars, can we at least ride horses? Had an idea for a Wild West pack. Saloons, shooting fish in a barrel, duels, being an 'Outlaw', exploring the desert side, or mines to obtain resources or help others. Could include trains, and robberies that occur during the day, but picking the wrong person can result in a duel to the death. Or being a sheriff or deputy can mean you can lock them up, or punish them by getting them to shovel horse manure. And have two towns for the west, a literal ghost town with mining history, and a full-on desert town stuck in the culture of the wild west. It gives mixology a twist too for barmen, could get one of those long bars, and do the sliding down the bar of the glass, to the sim. Depending on the skill of mixology and charisma of who you slide it to, they will catch it, or it will shatter and cause a barroom brawl. Brawl clouds go up everywhere around the Saloon. Victor is wanted by the sheriff if not caught, etc.
One thing that is playing on my mind, is a normal rock band, with multiple sims, drums, bass, guitar, and singer. Could we just have something like that in the High School one, with pool tables? Another idea, that could work if people have University Life installed, is if the sim excels at High School, they could do Uni and Highschool all at once saving some time in their life span as a sim, but it adds a +1 to stress each additional thing they do. And in addition, if there can be a game update for University life, where you can 'Study Abroad' where you can study and travel at once too rather than it just being a holiday.
An additional pack, which I don't think is necessary but thought to mention it anyway. Business Typhoon pack. Helicopters, private jets, business assistants, dry cleaning, this is where you can manage a cooperate business all over the world, add a stock system to Sims which is live based on how others play it, and the money is made by agreed deals as the sims travel as business typhoons. When there are protestors based on the means of production, or eco risk, or anything, you can decide how your company adapts and evolves, and where to build factories, adding a small Sim City element. This pack also allows a 'Get To Work' element for factory workers/manufacturers to learn robotics and handiness skills. Adding to the problems with 'Eco-Life' & 'University Life' so there's a backstory to how it ends up that way.
Even so, a Pirate Pack where you can be captured on a sailing ship and have to work your way to freedom as a pirate buccaneer, learning fencing, how to speak pirate (maybe), learning sailing, fitness, and handiness. Introduces boats, sailing ships, fishing boats (for fishing skill, and Deep Sea Fisherman career) adds more purpose for mermaids too, and deep-sea exploration with Submarines. Adding to the element of Holidays too with Cruises for sims. Adding stuff like Seaplanes, where Sims can rescue stranded sims on islands, and even have a call back to sims 2 castaway re-introducing monkeys.
Daredevil/Cheap Thrills pack: skydiving, motocross, acrobatics skill, monster trucks, sim derby, racing, adding mechanic career with racing, or repairs and sales, sword swallowing, daring feats of illusionists as a magician/illusionist/gypsies psychic escaping that tub of water all chained up, or the classic saw in half trick -adding to the Realm of Magic pack seeing shows popping up all over, or becoming a stuntee as a new career 'Stunt Artist' for movie, stage or tv.
Zoologist & Circus pack: dolphins, lions, tigers, bears, zebras, elephants, monkeys/gorillas, flamingos, and giraffes. Being a conversationalist for mammals and other animals by bonding and teaching tricks as a new career of Zoolologist, or flaunting them as a 'Circus Ring Master' with lion tamers, so there's the caring and cruel side of animal handling.
Mastermind pack: Burglers. But. You can do heists, and have a 'Get To Work' element where you have to steal and escape without getting caught and stealing enough gets you enough rep from doing so, you can form an underground syndicate, and launch robberies all over the simverse, plan blueprints, add banks as a thing in sims, where sims can get loans from to purchase houses or for university or a holiday, and have the sims who are thieves to find ways of stealing the money without getting caught. Then there's jail. Jail in the sims is just full of erratic, mean, and evil people. Then! Escape again! Earning you the achiever of 'Fugitive'; and the buff that no wall can hold you, so that means if you try to wall off this sim, let's say the old cheeky remove the ladder of the pool, they will find a way, to escape, and survive. Of course, having an element of 'Clean Slate', but it costs a ridonkulous amount of Simoleons.
Disco Maina pack: 70's, 80's Nostalgia. Dance battles, laser lights, smoke haze, new dance moves, bring back the thriller, afros, crazy fashion, a lot of pop culture stuff, including leg warmers, aerobics skills, arcades where kids waste simoleons playing too many arcade games, etc.
New Worlds pack: After reaching the Alien planet Sixam, you can collaborate if your skills are high enough to help construct and craft to explore new worlds and meet older versions of Sims from The Sims, Sims 2, Sims 3, etc. And even revisit those places from previous sim games, meeting all those other characters. Either that, or, it's exactly like spore, but doing it from the control center of Sims, and piloting a ship through space, etc. A Get To Work element of space travel. And could have a whole different game dynamic then, plus the everyday living of looking after a crew of sims.
There are endless ideas, but just no one doing them.