if he wants to walk away from music, after devoting every free waking minute over the past decade, its his choice.
I’ve never met a 15 year old who knows precisely what he WILL be ABLE to do or even WANT to do 3 years from now. kids do change their minds, ya know.
So it may be up to you to do the research, and guide him, so he doesnt make a mistake that he will later regret.