IMO keyboard and mouse will always dominate controllers in the FPS/RTS markets just for their accuracy. When you play an FPS on console what you don't realize is the games have a slight auto aim... Halo 3 for example, if your close enough to them on the using the cross ...
If I recall, the original design of halo was an RTS and not an FPS and it was for PC/Mac.. but thats what I think I remember in an issue of a magazine Ive since forgotten, that was from 1999
