I'm still happy with TS4. I wouldn't throw this whole look out but I'd need to see the whole game. I'm on the fence about whether I'd go to TS5. I do know I'll plan to keep playing with the game I have certainly for a while. I mean, I've had it going a while now. I like the refreshing of TS4. They could even rename it if they want as long as I could keep the sims I established.
If TS5 is gorgeous, has great features and importantly, appeals to me and how I want to play, of course I'll consider it. I like continuing with what I've got going and I'm happy for them to make accommodations that appeal to more players especially if it doesn't involve abandoning my own game. If anything, they need multiple ways to play. The actual graphics aren't a big deal. I just wouldn't want to go more cartoony than we have and there's a level that is "too real" for me. For this one, I'd need to see what the housing and world looks like.