I remember this thread, a lot of it really seems rather "If the Sim characters were in a different game/genre" rather than "what if the Sims were developed by a different studio"
I know a lot of it is meant to be humor but well... would also be nice to see more actual speculation.
I'll give it a try:
If Bethesda would develop a life simulation I can imagine it would be very photo-realistic, there'd likely be shout-outs tot heir other games like Vault-Boy decoration items and the game might be very resource-taxing and very buggy on launch (so nothing new with that last one) If it would spawn something akin to Stuff Packs I can imagine a 50s Retro Pack might be one of the first ones.
If Paradox would develop a life simulation I can imagine it would be very solid, extremely moddable and would offer actually challenging and rewarding gameplay like Sims1/2. I can imagine the art-style would be similar to Sims 3 (meaning less charming and lively that Sims 1 or 2) and there'd be a lot of small and large expansions that would actually be worth the money they charge for them and the development team would take player feedback on their official forums into account when fixing, changing, expanding and adding game elements.
The general "atmosphere" of the game would also likely be more on the European side than the obviously American Sims series (not a pro or a con, just the impression I get when lookign at Sim City 4 and Cities: Skylines) and there'd probably some Easter eggs concerning a comet being sighted, Bears and general Swedish/Scandinavian culture.
Avatar by MasterRed
Taking an extended break from Sims stuff. Might be around, might not.