Well, I was looking forward to moving on to Immortal and winning it by any means in the next Challenge and then gradually adding more interesting twists (like the three Emperor Challenges so far). But with the upcoming changes to the AI, I might play another Emperor Challenge or two. If by then someone has taken up a series on Immortal, I might then retire from the Challenges and maybe largely from Civ4 as well. There are only so many times you can play a game. I find my own games less and less focused. For me, what is really fun about the game right now is OCC and the Challenges. I don't have any interest in MP.