I've always kept an eye on cochlea-related biomedical advances.
About 13 years ago, I opted to get a cochlear implant in my left ear and my left ear only because, on the recommendation of my hearing specialist at Hopkins, I wanted to save my right ear for future advances like this (thinking that a surgery-scarred cochlea might not be usable).
Since it's been 13 years and nothing has come, I've started regretting that decision a lot. Since I live in a city and work with a lot of people around me, I could really use implants on both sides to hear from all directions.
On the other hand, these things are EXPENSIVE to keep/maintain. So I suppose it's just as well that I only have one.