Hearing enhancement for everyone is easy with current tech. But people won't do it because it looks like you're disabled. But once enough people do it, it'll no longer look that way and be cool like sunglasses. But they are not. So we don't. Strange world.
Highly unlikely, given that people don't gratuitously wear prescription sunglasses. And speaking as a hearing aid user, the problem is exactly that of the article: making things louder only helps when you're listening to a single person in fairly good background conditions. Actually selecting and amplifying a particular voice is much harder.