Because Blizzard wasn't under fire from everyone and their mom about how steep the time investment is to participate in the main parts of the game. You never hear anyone say anymore that you have to have no life to play wow anymore. If anyone does say it anymore it's nothing more than trolling. There are guilds that raid once a week that have cleared heroic content. Now everything is basically a solo adventure with minimal effort on your part to have to put together a group for anything (that requires it) and you aren't tethered to an assigned schedule for the most part. By doing all of this and caving into the casuals, that I don't honestly think give a fuck about the genre, the game lost it's soul.