> if all the tickets are free

They're definitely not free; doctors have to evaluate what Watson says, and if Watson is wrong a significant fraction of the time, then doctors will spend a lot of time and energy barking up the wrong tree.

Eh, it's a tool. Some are useful, some less so. I imagine this would be a tier two kind of thing. It's an unusual case, what suggestions does the robot have? Maybe something obscure and easy to forget.

Doctors have to evaluate what patients say, too, and they're forgetful or clueless at least as often as anyone else. If the cost-benefit analysis favors having Watson (or whatever) around, great, if not, great, just another decision to make.