Very interesting post.
I think jim pinto's version of GM-less gaming would appeal best to those gamers who like world building.
As for myself, I'm an explorer. I don't really care for building worlds, but I like exploring them and heroically killing things that need killing. My version of GM-less gaming would be a published adventure that reads like a Lone Wolf book: "If the party chooses to follow the trail of the orcs, turn to page 141." The world would be revealed in the choices the players made by consensus. You could even run through the adventure again with different choices to explore other parts of the world and or story.
A semi-GM who's also a player (like the banker in Monopoly) or players simply taking turns controlling the monsters during the combat portions would work well in this version I think.
