Comments like this make me think people don't know how to use a DSLR. DSLRs are devices that you need to instantly change settings on. You need to be able to dial in exposure on a dime when the light changes. Who in the world, ESPECIALLY pros, want to pull the camera away from their face so they can fiddle with a clunky touch screen?
The touch screen isn't for shutter/aperture. It's for the now hundreds of other settings we have. I can change several things on my M faster then on any DSLR I've handled, including focus point.
And if Canon tweaked the UI a bit it would be even faster.
For certain things I want physical controls. For the rest...touch screen. (Not that this would be a deal breaker.)
That does not change the fact that a touchscreen really does nothing for your PHOTOGRAPHY. Personally, I can blaze through Canon's menu system as it is. Both on the 7D and 5D III (and the latter, which has FAR more settings, is still a breeze). Canon's current menu system wouldn't be any faster with a touch screen...in fact, there might be some difficulties using it. Adding swipe might make it functional for touch, but overall, it wouldn't really be any faster or easier.
They would have to fundamentally change how the menu system works to make it viable for touch...now, how many customers do you think would blow a gasket or erupt like a volcano if Canon did a radical menu system redesign to make, of all things, touch work better? One of the key reasons people stick with the Canon system is the ergonomics, button placement and menu system. I've messed with Nikon's menu system too many times to count now, and it just feels odd, Ironically, it probably isn't all that much different...there is a lot more vertical scrolling, and things often seem difficult to find that just pop out at you on Canon's system. But even those MINOR differences send me crawling for the exits.
Canon would lose MASSIVE numbers of customers if they screwed around with the fundamental design and function of their menu system to make it touch friendly. It's a staple, a fundamental, a critical part of what keeps their customers coming back for more and ridiculously happy (and a lot of Canon users ARE ridiculously happy...if they weren't, Canon's loss of the sensor IQ crown would have caused a hell of a lot more of them to jump ship and switch to whoever provides the better sensor IQ.)
Sure, it's a nice 'touch'...but a touch UI is probably the absolute farthest thing from an essential improvement that the 7D, 5D IV, and 1D XI really, REALLY need. It would just be icing on the cake, and god only knows at what additional cost.
I own a Canon 100D that already has a touch screen. Works very nice. It is in addition to the old style manual controls.