We'd still need surgeons until the robots are good enough. We'd need radiologists until they can add decent computer vision. Ditto for pathologists and other vision-intensive specialties. Orthopods are very hands-on and collect information through channels other than words. So there's a suite spot in the spectrum of doctors for something like Watson. I'd wonder about the ability to ask questions and ferret out socially-obvious problems like broken arms from abuse if Watson were a first provider.

Presumably you'd couple something like Watson with a world-savvy human physician assistant that acts as its eyes, ears, and touch.