As a hearing person who grew up with deaf family members (my mom & aunt are deaf), I think many deaf people will actively oppose gene therapy for deafness. In the deaf community, there’s a large subsection that actively oppose things like cochlear implants or any other attempts to make deaf people hearing. There’s a few reasons why:
First, many deaf people feel an immense pressure to fit into hearing society. I know in my mom’s case her hearing parents refused to teach her sign language because they wanted her to fit in with hearing people. This is a pretty common experience for deaf people and one that many of them hate (my mom included). My suspicion is that to the deaf community things like gene therapy might feel like another way to force them to fit in instead of being themselves. No idea if this is actually how deaf people feel, but it is an educated guess based on what I’ve seen in my family.
Second, many in the deaf community don’t view deafness as a disability. I think it’s viewed as a gift of sorts. There’s even a term for it called “deaf gain” (a play on the phrase “hearing loss”). Basically, many deaf people think being deaf is a positive and not something that needs to be cured. So, the idea of curing deafness with things like gene therapy is very controversial in the deaf community.
Third, the deaf community has its own culture. For instance, there’s different social norms that are unique to deaf people (e.g. if you want to get someone’s attention you flick a light switch on and off). One of the fears of the deaf community is that if deafness is eliminated then the culture disappears. So, in many deaf circles, things like gene therapy are viewed as an existential crisis. I’ve even heard things like this likened to cultural genocide (which is a bit extreme) because of its threat to their culture.
So due to these reasons, I can’t see this treatment actually being popular with the deaf community. There’s already a huge emphasis within deaf families to not use cochlear implants on their kids due to it being viewed as a bad thing. As a result, I think it’s unlikely those same families will opt for gene therapy. I think most of the cases you’ll see of gene therapy being used are deaf kids whose hearing parents decided they need it or with the subset of deaf adults who don’t share the views of others in the deaf community.