So surgery is a mechanical thing. Take a heart like X, make it look like Y. I can see robots being able to get there at some point.

Nursing, at least part of it, is about empathy and care. If someone is in the hospital getting robot heart surgery, someone has to help guide them through the practice. I do not see robot empathy in the next 50 years. Same reason I do not see robot counselors on the horizon ;)