I wish they would do a give free update where your sims can get sick and have to go to the hospital... and/or baby visits. There is still so much I would like to see in the sims.
I would also love to see an overhaul on careers. I feel like there is still a bunch they could add to the game. I wouldn't mind some more where you can also go to work (like the Doctor, Science, and Police Careers) or run a business at home (daycare)
More Hobbies would be nice too. I don't think honestly cars to drive is needed, but I would like the fix up cars like we did in previously. Pottery making (it would be cute to go paint pottery with your sims for like a friends day or date) More cool woodworking stuff you can build, more sports that you can actually participate in, archery, glassblowing or metal work, crafts for adults, and more water things to do on the beach maybe.
Also more things for kids in general. More after school activites... girl/boy scouts, clubs, sports and etc. Gymnastics would fun to add for kids and special clubs to raise skills.
More items for kids and younger. I feel like we are lacking in items for babies/toddlers.