I don't think so, the studies I've seen actually show the number of touchscreen devices is growing, and desktop PCs are shrinking.
Besides, this "touch-first" approach has been tried with win8 and in my experience it was atrocious
I'll just say that my laptop (Lenovo Thinkpad Yoga) has a touchscreen and I love it. Every laptop I buy from here out will be a touchscreen merely because the ability to reach up while I type and just tap where i want my mouse to go next is such a better system than working with a nipple or trackpad.
I think as laptops with touchscreens become more affordable lots of people will change across. When i'm forced to work on my work laptop without KB&M, I really miss the ability to touch my screen instead of working with the god awful trackpad.