They've moved on from Halo and so have I. I racked lord knows how many hours playing all the Halo games. And I'm not even a "serious" game. Over and over I've run through the campaigns for all of the games. Even twice on Halo 4, one on heroic and once on legendary. And ask the hours upon hours spent in forge. All good times. But enough is enough. I think saturation is the applicable term. And I only play the game, imagine living it every day for 10 years. I'd want a change of scenery too.