I probably wouldn't use a touchscreen to replace the keyboard/trackpad interfacing on my MBP, but I'd definitely welcome it as an alternative option. Most desktop applications developed up to now have not been optimised for touch-based input like many new applications for Windows 8/8.1, which is probably why there is so much resentment here toward that idea.
I do see it as the future though....
Minority Report, anyone? Apple/developers are in a good position for porting over more iOS apps into the OS X playing field; iOS apps are becoming more and more like desktop apps, and I would certainly applaud any effort made to take advantage of touchscreen support on a MacBook. At least by then, I could dualboot into two desktop OSes that support touching.