I'd be cool if they kept moving closer to the central US and start having the NCR meet the new Brotherhood
more like minutemen empire meets independent vegas empire
the legion is pushed further back by NCR forces while New Vegas stays independenteverything east of mississippi is never acknowledgedthe brotherhood rises up and kicks the NCR's ass in new california as the NCR moves further eastyou play as an ordinary dude who's town is destroyed during a battle between the ncr and legion and ya gotta rebuild it (or not because its just a side quest)
Fallout London would add so many options to the franchise though. Completely new factions, scenery is completely different, plus the world's largest (?) Underground subway system! Plus London has so many iconic buildings.
If you think Fallout can exist out of America then you have completely misunderstood everything Fallout is about.
i would like to see this as a spinoff or something. but how would as many people survive without vaults?
Vault tech could be a global corporation? Especially with rich people in various countries it wouldn't be unrealistic for vaults to be created.