Machine logic for health might be a very dangerous thing.. Humans have a thing called nuance .. I don't expect devices to develop this soon.
But humans are also prone for errors, e.g. just overlooking an important result from a blood test. I also think doctors won't be completely redundant for diagnosises, but I am convinced that in future, they will only be needed to confirm a diagnosis.
I think it will take some time to make ideal machine processing, they will have to do lot of testing and fix bugs - and then the probability of getting an error will be reduced to zero. Therefore, this direction has bright future!
Even if they use the latest technologies (machine learning, natural language analysis, neural networks, big data, clinical epidemiology, evidence-based medicine ) i think the key point will be the decision maker because there are people with the same problems but the cure differs as everyone of us is unique.