He's what I would like to see:
1. As many mentioned, musical instruments, bands, singing, and all kinds of musical aspirations like that.
2. Cars that we can actually drive.
3. Casinos and gambling! We can win prizes for our sims or they can lose tons of money and even get a gambling addiction.
4. Theme parks, amusement parks.
5. More culture and more recipes. How about more West Indian food and African food? And more Chinese food take-out options?
6. Update to go to work pack with more jobs we can go to: like Lawyer, Education, Stand up comedian, Firefighter
7. Much more romantic/friendship/family interactions without mods (or in addition to mods).
8. Churches, Mosques, Bibles, and being able to go to church without a mod. Also new spiritual aspirations, like "sage", "enlightened", "Faithful." This will lead to more emotional/mental interactions, like a "sage" level sim is going to handle personal tragedy different then one who isn't spiritual at all. They also probably will get depression or sadness less but may get "dazed" or abducted by aliens more.
Yes, I know there's a mod that does similar things but Mods are wonky and I'm really bad about keeping them updated with the game. Would be easier if this is just part of the game and will update itself with the game.
9. Assigned schools. What I mean is I want there to be a general public high school in-game but I also want a private school where only certain kids can go. Right now if I put 2 high schools in-game they will go to either one randomly and I can't control it.
Along with that, we can make "High School Rivalries" like I can make the prep school compete against their rival school. maybe we can add in high school sports along with it. Even create teams!
10. Speaking of which, I'm not much of a sports person but I think we can do more with the basketball courts and incorporate more sports into the game. Maybe they can have basketball, soccer, baseball and football teams. Once again I'm not much for sports and can only tell you so much but I think a lot of people would like to make some sports stars sims and it would just add more dimension and realism to the game!
11. I'd like to make sims with super powers. Not magical or occult powers, more like super heroes, super humans. They can get bit by radio active spiders or escape from a strangeville lab or something. lol.
12. As an update to seasons maybe we can have "town emergencies". Like a meteor shower hits part of Evergreen Harbor or a Tsunami hits part of Sulani. A Crime wave hits San Myshuno and a heatwave hits Del Sol Valley. Before a sim moves into a town they can see the likely hood of these emergencies happening in their town. And there can be other interactions where sims in other towns can donate or help out when another town is in trouble. Superheros, firefighters, and Military can help prevent certain emergencies, like alien invasions.
13. Much more cute romantic interactions and more realistic break ups, affairs and things like that. Sims should react when they run into an ex that broke their heart at the library or get nervous when they see their crush at school.