There are several devices coming out that will allow you to convert your non-touch screen into a touch-friendly one.
Logitech has a neat pad that you can touch instead of the screen, and some of the other devices work without actually touching those screens, too; many of us don't want them touched, shuddering at the image of all those fingerprints marring the view, but I think having that kind of interface in addition to the keyboard and mouse will catch on when these devices get released and become well-known.
The Win 8 sales for desktops are no surprise, because people love Win 7 and have little reason to upgrade. Some of us do, even though we don't particularly have a need for the touch interface right now, but most don't, and I personally wouldn't recommend upgrading from Win 7 unless you had a very specific reason for doing so.
I plan to bump my Vista machine up to Win 8, mostly because of TRIM support for the SSD, but I'll skip Win 8 on my other system that already has Win 7 and TRIM support.