So it's Blizzard's fault? What about the dozens of games that tried to recreate that golden age of MMOs and failed miserably? Ironically the only other MMO that's been largely successful is one that copied WoW's later ideas and that's FFXIV.
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I'm sure that's nothing to do with the MMO / gaming in general market right now and everything to do with a handful of people leaving Blizzard.