It has already happened in our lifetime with medical illustration. This is pre-gpt. It will just now spread. Are generated diagrams worse in subtle ways? Yes, but not enough to matter for the difference in first or ease of use.
I have a Masters in Medical Art. (late 1980s) 35 years ago some were saying ‘we won’t need medical artists because of photography’ and then a few years later ‘because of personal computers’. This isn’t the case. But when the general
public has access to a tool they love to talk about how a discipline is going away because ‘now anyone can do it’.