I mean there are also other events like Mr house wins, the new California republic wins or the courier/player with Yesman, takes over the Mojave as its personal kingdom or republic or whatever. So there is many ways you can play the aftermath of new vegas, there is a lot of timelines to pick not counting the events of fallout 3, 4 far harbor, and others. just a few choices can give power or lose power to some factions.