Perhaps I am too old-fashioned, but I have little desire to give up my "big" computer rig for what I would consider to be "toys" (to trivialize them a bit).
Since I sit at a desk and do actual real-world work for the majority of my computing time, the most efficient workstation for me is a tower case that I can open up and upgrade any of the many hardware components at will, 2 monitors, a nice keyboard that is easy, fast, and pleasant to use, and a good mouse.
My computer-related hobbies, including photos and music manipulation, have requirements that approximately parallel my work needs.
The fastest possible internet connection is always a positive, but not always under my control.
Yes, I now have the capability to watch old episodes of "The Beverly Hillbillies" on my telephone while sitting outside on a park bench, and take a photo of a butterfly that lands beside me there, but that is not a part of my core computing experience.
I do not foresee owning a touch-screen monitor on either a laptop or a desktop computer for a decade, maybe a bit sooner on a laptop, but that is still 2-3 OS changes in the future. And do I really want to have to reach up and touch the screen all the time for everything I want to do? What I hate most about using my smart phone is that while I am doing anything, MY HANDS ARE IN THE DAMN WAY and I can't see what is going on!
People here love to post those ridiculous and biased diagrams to show how small keyboards are ergonomically superior to large ones. Why is it not best for a comfortably seated human to look forward at a screen perpendicular to his eyes, with head erect, and work with his hands in a position that is natural to them?
Until a significant portion of the computing public really wants to use a touchscreen as their primary computing interface, why write it into the OS as a core default procedure? Sure, make it an option, but it seems secondary, at most, to me.