This is great news. Hopefully this will be expanded to other forms deafness like those caused by ototoxic medication, ear infections, and general sensorineural hearing loss.
This particular study looks like it's dealing with a pretty narrow condition and solution (protein missing - add gene for protein). I don't think this particular research can be extended the way you hope.
Yes, I would really like to see research targeting Connexin 26, since it's the most common cause of hearing loss, but it seems it's much more difficult to "cure."
I agree. The causes of deafness I mentioned are diverse and fall outside the specific focus of this current study. Ideally, future research will address deafness caused by these and other other factors.