I think you are misunderstanding the nature of the problem. There is no easy way to assess how good some mythical algorithm will be at interpreting pathology slides. Therefore, you are in essence asking doctors and patients to accept another non-human opinion about what is going on. So why should I accept your algorithm's opinion? I would rather have a human who has enough insight to say they are not sure and can discuss the case with me, and also understands that life changing decisions are being made on the basis of what they say.

Anyway, pathologists are most useful in unusual or difficult cases, which by definition have little available data. You want me to trust an algorithm trained using some kind of statistical mechanic on a dataset to interpret an edge case?