Fallout in literally anywhere but America. Please. We have an entire planet full of shit to loot things to explore and we only stick to one sodding Country. It's stupid. Fallout: England/UK should be a thing, dammit.
Anywhere else but america does not in fact have things that make fallout fallout, no vaults, no power armor, no "perpetually stuck in the 1950s" aesthetic, no pipboys, deathclaws, anything recognizable or easily identifiable with the Falloutverse.
So it could literally be called anything else and still happen in the same universe as Fallout. Basically any post-apocalyptic game not explicitly stated to take place in the US would qualify, for example Metro 2033 could easily be called Fallout: Moscow, or Sir, You Are Being Hunted could easily be called Fallout: Britain.
(Plus there's the whole thing of "the US was the last of the places to go to shit in the entire world and probably least buggered up place" since the European Commonwealth dissolved into infighting after the resources ran out and most of everywhere else ended up in a similar state when the Resource Wars ended and then got doubly screwed when full-on nuclear war between the blocs started.)
Now while it might be interesting to see how the rest of the world developed and while it may be thought that it'd give the developer more free rein over the visual design, factions and the like, I can guarantee it'd just end up with:
- not Power Armor (It's a Nuclear Knight Suit!)
- the
Братство стали, who are definitely
not the BoS and have never heard of such a thing and how dare you insinuate they did.
- not-Vaults
- not-pipboys
- not-Deathclaws
- not-Super-Mutants
- retro 50s aesthetic but modified slightly to fit the nation the game is taking place in.
In order to make it more recogisable and marketable as what has collectively been dubbed the "Fallout aesthetic". So basically it'd just be "Fallout but everyone's got an accent and things look slightly different."