I think the direction sims 5 should go would be to allow multiplayer online. I'd love to play with my friends and share a family on a lot! I can't see them adding much else that would really revolutionize the game.
I personally prefer the lots to open worlds. The loading is so much smoother, no lag or glitching as much as TS3. And I can travel anywhere with my sims anyway, it jaut works for me. As for rabbit holes...I think many are necessary, but some I would love to see updated to be playable. I don't need to see my sims in the movie theater, or at their desk job. I wouldn't mind joining my kids at school sometimes though, or to see diving underwater! Following a sim to space and sewing the alien worlds would be cool, but I also think that at that point it starts to become a different game entirely and not really worth the effort.
And, the thing is, I feel like with each expansion I get some of these new things that flash out the things I want, and I can pick and choose what works for my game and my wants :) overall I think Sims 4 is well done. It took me awhile to buy it...I only got it recently as I wanted there to plenty of expansions or before I bought it, but I'm enjoying it more than TS3.
