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Apparently he feels that hardcore players do not care about the game. After reading that article associated with the tweet I can only assume that he has been threatened one too many times and decided to be vindictive turning WoW into the horrible game it is today.
It is pretty comical that he would make that comment when it is the casual players who have done more to destroy WoW than anything the hardcore crowd could ever dream of. Watch this if you haven't. It pretty much sums up what WoW has become these days.