The thing is, they won't be. They'll be busier than ever. Frequency Therapeutics hit the nail on the head discussing the market of millions of people who have hearing loss in just the US. They discuss the current state of the patient population, and why they don't visit audiologists: they don't want/prefer hearing aids, they're not aware of their hearing problem, they don't want to acknowledge it, or they're already aware audiologists can't help them.
When there is a drug to treat these conditions, interest by that 80% of patients that aren't helped by hearing aids is going to overwhelm their offices. Especially those that need an audiologist to get a referral to an ENT for the injection.
In my career and personally, I have learned that doctors aren't always the most entrepreneurial types, they don't think about gaining the edge; they go by book. Perhaps that's why many see this resistance to the shift, they only look back at what is known and not what could be possible.
Frequency Therapeutics has a lot of work to do in this area.