I personally think that WoTLK made the game a lot more user friendly. Vanilla and TBC weren't exactly the easiest to deal with if you were alone and didn't have a guild to run dungeons with or raid with. I imagine thats why a lot of people came to WoW back then. The problem is that people are getting tired in general of the game. A game isn't supposed to last forever, they come and ago with time. WoW's doing a pretty good job of holding a lot of people on though. I don't think WoW is dying out though.. I think it's more falling to a lower equilibrium that eventually it'll meet. I think we'll find over the next few expansions that the sub loses will become less and less dramatic and eventually things with bounce from a specific high to a specific low for anything later on.