With today’s advanced technology, most deaf people can be taught to speak (and cochlear implants can help them hear, although the status of these and other devices is questionable as to whether considered halachic hearing).
On the same token in regard to a shoiteh, whereas in previous generations he was what he was, with today’s medicine with antidepressents or other medications, perhaps there is a change in halachic status if he is medically able to function in a normal or semi-normal manner?