I want to do a sword-art Online RP suuuper bad!
But the idea I have is way after the fact of the original scenario. You know, how all immersive MMO's were linked? Each of us could be from a game, or two people from the same game. Alfheim, SAO, and a few others we've made up individually.
The plot would be a Virus that takes shape of an enormous data-eating dungeon. The dangers of the virus would be leaving someone in a coma (unless we want to take a different route).
Once a game is taken over completely, the virus-dungeon appears in a new MMO.