With Skyrim and then Elder Scrolls Online being smash hits howabout Fallout Online? The game world would be perfect for that!

I don't know about "smash hits", but I like TES and Fallout as single player games.

Once other players are introduced, the whole game changes. An apocolyptic world like Fallout could make for an interesting MMO, but not the Fallout world specifically, in my opinion

Others may like it, so what do I know