All I can say is that we prolly will never see hair cell regeneration. Yes, stem cells could cure hearing loss..........but it's still very much in the rhetorical stages right now. Frankley I think that the CI,hearing aid and other hearing related industries have too much profit at stake, to even ALLOW hair cell regeneration. Besides, I know people with spinal cord injuiries who got injuired back 30-15 years ago and they were told that spinal cord regeneration was just around the corner...............*looks around* Gee, nothing's changed!