Funny that you bring this up....
I got a survey asking my thoughts on the same topic. Appearently, MS is considering selling a mouse/keyboard combo for the 360 which would allow RTS game play. Honestly, I'd take just the mouse (i don't use a keyboard in RTS games unless i'm squad selecting) and since 360 has USB ports, I don't think it's a fantasy to see this come to fruition. Then again, if RTS games are successful on 360, my PC will never be used for games again!

It's all I play anymore on my PC.... and Worms 2....
