No fair! They're using brains against us! We removed our brains to make room for guns and explosives!
After looking at it for a bit I feel like a battlestar theme for the game would have been great; I know there are licensing issues.
I think that would incredibly limit the expandability of the game. Look at most successful non-historical mini games, having a variety of forces to choose from is a big plus. I remember reading somewhere that there were other factions in the works. For BSG, there are really just humans and cylons. Or even if you did the different colonies, they would still be fairly similar (as opposed to alien race X that uses bio-engineered ships, alien race y that specializes in boarding attacks, etc.).