I think that thinking about where the desktop pc is going to be in ten years is a little short-sighted. We're already moving away from the desktop with all manner of specialty appliances that focus on one area of computing. From game consoles to internet appliances to cell phones with email, we're getting away from the all-in-one computing unit. I, for one, doubt that in 10 years computing will still revolve around a single Central Processing Unit and function as we now know.
Think how computers have changed in the last ten years. The internet totally came out of left feild for most, yet is probably one of the biggest phenomenons of the century.
I think that in ten years, no one will even think to care.