I'm going to go with a hearty combination of "hell" and "no." That said, I actually wouldn't be too upset if they did. All my friends ever do now is play MW2, I play it too sometimes, but honestly I just don't have as much fun with it as I do playing Halo. If they implemented a subscription fee, I doubt my friends would play it either, which would mean I could actually start gaming with my friends again, instead of just joining their party, then going off to play whatever I want while listening to them make frustrated cries about various things happening in MW2.