The doctors I know tend to think that it's at least 90% that way already (and has been for a while), at least if you're a primary-care doctor seeing patients in an office, rather than a surgeon or some kind of specialist. The typical patient isn't presenting with a rare disease worthy of a medical TV drama, and instead the main problems are patient-interaction ones: getting the right information out of them, picking treatments that the patients will be satisfied with and follow, figuring out what complicating lifestyle factors they might have, building trust with the patient and family members, etc. With the increasing influence of evidence-based medicine, where doctors are supposed to follow experimentally validated rubrics, the diagnosis itself is often semi-mechanical anyway even when done by a human.