Not replying to anyone in particular, I was thinking how we came to perceive sound as it is. From the day we humans were born, or from the time we evolved to be able to hear things, our brain essentially regulated how responsive we are to certain sounds. The brain makes sure that typical sounds do not to overwhelm our sense of hearing, but it also to makes it so things are not completely inaudible, and this creates what we perceive as a volume for normal listening levels.
If the brain plays almost all the part in how sensitive we are to what are ears tell us, then might it be rational to think that if we were able to completely control neurological functions, we would also be able to increase, or decrease that normal listening level of volume? I imagine a sort of interface with a volume slider that controls how loud we hear things, perhaps a pot hooked up to our nervous system. Of course that's a pretty far off thought that only an uneducated person like myself may think of, but if something remotely like that were possible, it would mean that we would be able to listen to very quiet volumes from our headphones, while hearing that it is loud, thus protecting our ears in the long run. I also image that by that time, the level of scientific advancement will be high enough so that we wouldn't have to worry about damaging our ears (maybe a certain drug will restore our hair cells).
It's fun to imagine what could happen, but for now, fully understanding and manipulating our nervous system still seems a long way off.