Many deaf/Deaf parents want children who hear. And I think absent the cultural consideration, almost all would want children who hear.
But you can't ignore the cultural consideration. If you are deaf, and have a deaf child, curing that child's deafness means they will move away from you later in life. It's a kind of alienation even when the child remains bicultural, they usually end up almost entirely in the hearing world.
That said, most deaf people who have children have hearing children anyway. Hereditary deafness like that is relatively rare like that.
But for people from such families, and who live in a culturally deaf world -- they are not disabled. The cultural environment they live in is ... one in which deafness is not disabling. And it's going to be a very high hill to climb to convince them that they are missing something. They certainly don't feel it. This is particularly true in the United States which has such a proud tradition of deaf culture and education -- you can go all the way to doctorate level studies in ASL, work in ASL, the hearing world being a strange foreign culture you only rarely wade into -- only rarely need to.
I'd cure it for myself, and my child if I had one. No question. But I'm not culturally deaf. I feel isolated by it in the same way most hearing people anticipate deafness to be as an experience. But again -- people who live in the deaf cultural world -- they do not feel that, and they don't feel disabled because, in their context, they aren't. It's hard to communicate this to most hearing people. The usual response is dismissive, and unfortunately I think a lot of that ultimately goes back to very old metaphysical attitudes towards language and intelligence. A lot of hearing people still don't believe, deep down, that sign languages are equivalent to spoken languages, in particular. It's just gesture. You're lacking something essential to the human condition without spoken language. Etc. But for the culturally deaf, nothing is missing from their lives, except the perception of sound.