I had this idea that Fallout setting works very well (as any post-apocalyptic setting) for MMORPG world. There are lots unexplored, dangerous locations, there are lots of loot (remaining from the old world) and all the new players are people that have emerged from another just opened vault. Thus it makes sense why this world becomes more and more populated (presuming the number of players grows in time) and from where they spawn.
What do you think?
What do you think?