It's no secret that I'm into World of Warcraft for the lore. I play the game for the story, to a great extent. And that's what makes end of expansion lulls the hardest for me - I know that there will be no new story. This time around, Mists of Pandaria has just absolutely ground me into the dust. I simply can't make myself be interested in playing when I know the story this well. I've leveled Horde to get a new look at things, run the Dominance Offensive, done the Isle of Thunder, even run Siege LFR on him. I've seen it. Alliance and Horde, I've seen it.
I know that a great many players, perhaps the majority of the game's players, do not care about this. I accept this as fact. I don't expect you to put lore and narrative ahead of gameplay. I know Blizzard designs the game with gameplay firmly ahead of the lore. But it's still a huge issue for me, and there are other players like me - not only does it affect how they're playing now, but it controls whether or not they'll play it in the future.