I'd like to play an RTS game where you don't control the units directly, but instead just give them general orders that they try to carry out to the best of their ability. The player would focus on coordinating combat at high level directing where the units should go and what positions they hold. The units would have to have plausible behaviors, so they wouldn't just run into gunfire, but take cover, try to coordinate with each other, etc. The units would also have to have modifiers such as morale, so if a unit suffered heavy losses it might break and flee for example. I think you could get some really interesting emergent game play come out of it.