I don't think it is necessary to introduce pure keyboards and mice combos, but they could innovate a device that is good enough to play RTS games. Such controllers could be sold alongside regular ones. I don't see why that can't happen. Trouble is that the RTS market on consoles is so weak, designing a special controller may not be feasible.
Exactly, why are they trying to dig into the RTS market?! They've already sapped the life out of PC's FPS scene! RTS games are PC fans' safe little sanctuary that will always be best on PC.
Have you seen those special game key pads? They made them for Battlefirled 2, Call of Duty 2, and I think LOTR BFME2 as well.
I can see that working out, but the mouse part is the important part for me. I remember for a while I was playing Unreal Tournament with a gamepad+mouse combo and it was fine. I just need the mouse to aim.