Everyone would be doing it! We could all go into each other's homes, help out by offering money or trading items, people would be able to design their own furniture and stuff to get uploaded just like we have people designing their own heads/bodies/other graphics like that. Haha it would probably be really hard to create just because everything would have to be scripted to the point that it could all be manipulated by players(and a program to allow them to manipulate it efficiently and easily would also have to be designed).
If you managed it though, you'd have a really popular server on your hands! The Sims used to be the single highest selling PC game in history, if it still isn't.