I suspect one reason is the schleppiness of implementation. Healthcare is hard enough to navigate as a doctor or patient. Another is the existence of edge case

I suspect one reason is the schleppiness of implementation. Healthcare is hard enough to navigate as a doctor or patient. Another is the existence of edge cases. While not quite as bad as self-driving cars, they still require human review. One radiologist I spoke with was under the impression that his field was going to disappear in the next n years. I don't think that will be the case entirely, but it will change. One reason why image detection is ripe for this kind of "disruption" is that some of the highest paid medical fields (dermatology, radiology) basically employ expert image recognizers. On the other hand, I'm not sure what percentage of health care costs goes toward employing doctors directly, but I don't think it's huge compared with the rest of the facility and equipment and administration cost. The real benefit will come when people don't have to go in to the doctor at all. Which makes the smartphone "take a picture" aspect pretty sweet.