I wouldn't mind multiplayer so long as it was optional, because I do like the alone time etc the game gives me. I think the easy solution would just be a toggle like "let your friends visit you?" and therefore only have people you trust visit you. Because I'd hate if some rando just came over my sims house and destroyed stuff or whatever.
The main problem would be CC... obviously, not everyone is going to have the same CC, and with the fact CC is one of the things that is currently keeping TS4 alive, I worry about the TS5 not having that same community of CC creators etc, if the game isn't as compatible with it's usage.
