I see some questions have to be addressed in this matter. Pro bodies, when used by pros, must must be capable to take some abuse on rough conditions (eg. snow, desert, war zones, etc).
I personally think touch screen could be too much a hassle in such situations. Button operated functions can be memorised and operated with your eye on finder, which is how most pros do it.
If ever the rear plate of a camera is flat, touch-operated screen... Well, here's a case: Imagine you are in a conflict zone at night and you need to change the AF point. No button, no joystick whatsoever. You might have the LCD screen darkened, yet the light might still be too bright to put a spotlight on you (pardon the pun).