Why not have every game type ever made? Invasion, Race, Assault, Stockpile, Extraction, VIP. All of them. Even if some of them don't find their way into MM, at least have them as an option for customs. I mean, how hard would it really be to do such a thing? I saw people do some really crazy and inventive things with Invasion in Reach. Hell, Reach in general currently stands at the apex of number of gametypes and options for multiplayer in Halo. I want to see more of that flexibility and then some in the future, as the more options there are the more opportunities there are for making all sorts of wild, wacky, and just plain awesome maps.