It's remarkable how the body over comes. My guess is that since your decline has come on gradually, your ability to compensate would certainly be something you could learn to understand and adjust for as needed.
The problem IMHO is simply being aware of the problem in the first place. I lost all hearing in my left side about 15 years ago. Struggled with it for a number of years but in otherways the hearing in my right side seems to have actually improved. I find myself having certain advantages with the directional nature of my situation.
Stereo is still a problem but spending a lot of time with reference recordings and a super smooth swivel chair gets me through it. Regardless...I leave the mastering to the pros . Too bad you can't get price break on half a headphone