These are the OFFICIAL multiplayer win conditions (p. 31 official AEG rulebook):
If you want to play a shorter multiplayer variant, a player wins if, at Sundown, that player has more control points than any other player’s in influence (rather than each other player’s influence)
That said, TOs and casual players are free to utilize either of the above win conditions (Knockout vs. Whole Pot).
Common Sense and Theme - Buildings remain, Dudes/attached goods leave (even 0 upkeep get some basic rations/sourdough biscuits), but Totems are basically structures, they remain. Ol' Howard still haunts whatever building he attached to
--> The next rulebook update may well include an updated multiplayer section, as well as possible support for other formats (e.g. Derringer, Double Barrel, etc.)