If I'm honest, Skyrim felt like a (admittedly very good) single player MMO as it was, with the massive number of quests in my log at any one time, the alchemy and blacksmithing, and a few other things that made me feel I was playing a more advanced, Hi Def, WOW.
I'm sure it's possible, but... does it have to 'kill' WOW? Or would anyone really mind if it was just very good, enjoyable and successful?
Seems we allow pop music even tho it's not all as good as the Beatles, and movies keep getting made after Citizen Kane and Godfather. Why can't people try for a new MMO?