If the change is permanent for everyone, then how will something like the Pandaren introduction work. What about the intro video of the orcs, it talks about Garrosh and his war. What about the cinematic that leads you to Pandaria, where Garrosh orders the Horde to go there and take the continent. Will you walk into a room with the new warchief, and then the game cuts to Garrosh screaming, and then you're back in the room with the new warchief again?