Sure but I think it may have to do with people not getting what it is they really want. By that I mean people are more likely to stick to an IP they care about no matter the bugs of the first month and frustrations of early release. It's when people aren't sure and try out and game it's far more likely they will abandon it because the game did not sway them and the IP wasn't doing that either on it's own.

I cared about LotrO as a game and so I stuck with it the first year when a lot of people moved on (and came back later...) I did not care that much about Conan though I liked a lot of things about it, so I left. Eq2 keeps me coming back no matter what new game releases.... Looks like it's the same for WoW players. Aion I really love so I'll play until something I love more comes along. The thing to blame isn't just on the players moving on too quickly, we have too much to choose from and devs have to try harder, it sucks not all games can succeed but that's how our commercial system works, you succeed you profit, you fail you disappear.