For a start, let's be specific about what pathology the term "cure" is applied to: hearing loss or tinnitus?
Secondly, let's try to be specific about what is meant by a "cure": does it mean a total reversal of all tinnitus symptoms and full restoration of hearing loss? Remember, most things in medicine are not perfect. As an example, if someone has a broken knee, then, post knee surgery, the condition of the patient will usually not return to 100%. So we shouldn't apply the same standards of perfection to hearing loss and tinnitus, either.
As for when there will be a "cure" - either partial or full - for hearing loss and tinnitus, this could realistically be within the 3-4 years (best case) or within the next 10 years (worst case). Agreed these cures will not be 100% and may not work in all cases, but there will be something available to the "mass market" in the next decade. There is a lot going on in the field of otology; I have previously posted the market analysis information found in the attachment (there are at least 8-9 initiatives at the moment).
As for myself, I have already managed to reverse sensorineural hearing loss of up to 25db, and another stem cell pioneer with more hearing loss than me restored up to 35db of hearing loss. And that's with today's technology. So it all depends how you look at it.
Full restoration of hearing threshold will probably not be available until many years from now. Agreed. But there will be inner ear therapies available in the next decade (to the mass market). The researchers of Stanford are a typical example of the elitist pure researcher; they have no clue what is going on in the real (business) world around them. Just look the attachment below - and I am usually someone who errs on the side of caution.