I work a lot with doctors where there also worries about being replaced with AI. The pioneers there say that won't happen but doctors who use AI will replace the ones that don't. Same thing in our field. And just like in our field there will always be niches where AI output isn't good enough and there isn't enough money to improve it so human specialists will own it.
Doctors? They're safe. They interact with patients, use physical tooling, demand for their work is growing because of demographics. And you really don't want a doctor who sometimes hallucinates advice.
Doctors won't be replaced by medGPT. They will be replaced by a nurse practitioner using medGPT. The financial incentives to replace highly paid doctors with nurse practitioners are just too high.