I just had an epiphany. The idea hit me like a bolt of lightning. This is an amazing idea for an MMORPG.
Think about this one. You make one massive, interesting, practical, compelling world. And then you let everyone play together on it. You know, like everyone in the same world. You get more of a multiplayer experience playing a battlefield game (64 players at once!) or tf2 than you do today's generation of MMOs. I mean if you want a big chat room you can always log into IRC.
Bring us a real MMORPG, not an instanced player lobby with padded walls.