One time might be enough. Even if all AI development would stop now, as in these are the models we got and no new models are created, we could still do a ton of work with the existing models. Much more than what we currently can. We are constantly learning new ways to get better results from lesser models so AI performance would continue to improve, even if the models themselves would not improve.
Like, think of a stupid student who always gets an F in a test. What if you would let him do the test with a text book? With the text book, he might get a D. The student didn't get any smarter, nor did he learn anything, but with a small trick, the output was improved.
And even if LLM would be hype, the medical classifiers certainly are not. The usage of classifiers in real medical work is constantly increasing and we are getting results that show that they actually work. It is not hype, it is just poorly communicated to the general public.