I don't think that's a very good comparison. Cancer strikes at the very heart of what we are (a bunch of cells which are expected to cooperate and sometimes don't). Compared with that, tinnitus seems pretty hackable.
Baldness seems like a good comparison, though, given how hearing involves hair in the inner ear. Cancer is thousands of different disorders so it’s unlikely there will ever be a single cure; making hair grow where we want it is a simpler task.
