As you know every 1 year or two WoW subs are declining. To combat this situation Blizzard is focused on mini-games HS/Heros of the storm/Diablo 3 which was a good decision, since Activision stated that they have good profit from the mini games. My guess is when WoW goes down to 1 million, we will still play, but alot of prices will be increased and also wow store will be the place to purchase everything. Or They will make another MMO that is based on star-craft universe/diablo and leave the Warcraft to the mini-games and to the movies that they will produce in the future