If you google "PC Demand," you'll see an number of stories about how strong demand is for Windows 8 Touch machines. (Non-touch demand, not so much.) Retailers cannot keep them on the shelves and now there are shortages.
As Touch gains momentum, we might be looking at a huge upgrade cycle in the next couple of years. I know the head of Intel's PC division did a presentation a couple weeks ago (its on the website), and towards the end he was asked what will be the biggest surprise in the PC world one year from now. His answer was that Touch will become the standard for PCs. This was based on thousands of interviews and focus groups they've done with customers over the past few months who loved it. He might be right.
Windows 8 requires touch. That puts into question the future of desktops specially those with 20+ inch screens that are not positioned close enough to be touched. I guess you could add a small touch-screen tablet to mirror the image on the big screen and use it for control. This would work well for integrated PC/TV type set ups and it would be a way of supporting all the legacy non-touch desktops floating around out there.