I suppose until hearing restoration comes out, that if all goes well, it could be within 5 years (they've completed phase 1 showing safety). The next big thing will be efficacy results in phase 2 and hopefully by this phase we will have answers to 1.) does it improve hearing and 2.) does it resolve tinnitus? Then a couple more years demonstrating safety and efficacy in larger populations with a phase 3. A whole load of potential setbacks can prolong this however, I must say over the last 5 years there has been considerable progress and we are closer to a cure than 5 years ago.
Now we've got bi-modal neuromodulation to hope for if tinnitus is the main problem causing you difficulties until further advancements. There has been emerging evidence this works with a product (Neuromod) already lined up to go on market this year.
What concerns me, is that, all this progress can lead to nothing. I don't see any other treatment targeting tinnitus coming anytime soon, the new epilepsy drug (Trobalt redesigned) I would imagine is 10 years away along with any new drug developed by Cognosetta (the new company formed in Florida). This could take up to 10 years, if ever...