Well the boys and girls at a Perth hospital in Australia have just successfully been able to grow human vestibular supporting cells; inner ear cells that support the survival of cells controlling balance, movement and orientation.
This was a news story last night (11th April 2007). I am about to email the Professor to find out more details but looks like there is some hope for us.
I would say that we would be looking at a fix for Balance first - 2 years, then deafness following that.
Whether its applicable to us AN"ers, I don't know but I will find out more detail and post accordingly.