@Mor - I think it's more likely that we will get more and more minimally invasive surgeries. There's only so much a doctor can do from the outside. Laparoscopic surgery and robotic surgeries are becoming more and more common now though.
The only exception to this I can think of is if they one day develop a viable nanobot that can do surgeries. But, even then the nanobot will be "invading" the body, even if they aren't entering from an incision.
They would probably be put into a category of their own anyway.