Multiplayer is sort of a necessity. The ai is brilliant, but can only keep one occupied for a certain amount of time. Multiplayer guarantees that GalCiv2 will have unlimited replay value, much like games such as Counter-Strike, Ut2004, or a more relative example, Civ4. Multiplayer shouldn't be an expansion, it should be a patch. I think that one of the admins mentioned it wouldn't be that big of a deal to code it in, and it would only add to the experience. GalCiv 2 is an awesome game, and all multiplayer would do would make it more awesome.