Its already happening, I am not a doctor but work with them closely. One patient used ChatGPT for his problems because he waited so long for an appointment. He was a bit neurotic and talked the whole time how one doesnt need a doctor anymore as ChatGPT is already good enough.

The real main problem is that you need to wait to get help, may it be a therapist or an eye doctor. But ChatGPT is instant.

This part worries me the most.