I don't care. The definition of what a disability is, is clear. When all people would be deaf, would deafness be a disability? No.
It doesn't matter whether you personally want to be cured or not. If someone has no legs and they like it, it's still a disability because the person has a clear handicap in the current world. It doesn't matter that, in a hypothetical world where heaving legs doesn't matter, it wouldn't be seen as a handicap.