I think this is going to be a make or break expansion for a lot of the players of this game. For the most part I think people just stuck around through ups and downs but after WoD's end game (Facebook game) and the 6.1 patch, a lot of that loyalty from the playerbase has been broken down.
Thursday, this is going to be the most important expansion announcement in the history of World of Warcraft and it's going to dictate whether this game can win back loyalty or make the decision to go to FF14 or GW2 much easier.