An MMO that actually feels like a real world.
The way you accomplish this is by appealing to all kinds of players. And i dont mean like they do now where that only means something for solo players, something for collectors etc. Ultimately you still have to like a very specific type of game.
With unlimited resources, manpower and time, i would just make a world, and everyone would be part of the world, but the world would be full of actual feature complete games in it's own right. Like fighting games? Go the the arena and play the fighting game, like racing games? go to the racing tracks and play our racing sim, arcade racer, or kart game. Like farm games? Just play that, just want to be a merchant? There is an entire game for you too. Those wouldn't be lite versions of said game types. They all be full games, with multiple game modes, ranked systems etc. You would only install the parts you want to play. You would earn currency in all those games that you could then spend in the 'outside' world. On your character, land, housing, whatever.
