Hi. Former guitar shredder here.
I have news for you. The idea that the instrumental performers with "the most talent" will no longer get paid big bucks in the future isn't something you have to wait for.
It has been going on for at least my entire life.
After I had been playing guitar for about 2 years in high school, I could play nearly any guitar part of any popular song (I came of age in the 90s, the grunge time frame. So, admittedly, a low bar.)
Most of it just wasn't very complicated. If what mattered was being able to play things note for note, capturing all of the "feeling" and what not, for most popular music that just isn't a tall order.
I'm not being a braggart; I was nothing special. My point is that youtube is filled with kids who are _astounding_ guitarists.. and who will never make any money off of their guitar work. Technical proficiency isn't what gets you paid.
I still love all of my Shrapnel Records artists that I dutifully bought albums from growing up. I am thrilled beyond belief that monumental talents like Tony MacAlpine are still able to record and perform after decades of being unknown outside of the guitar-nerd community. And I am escstatic that new younger talents are emerging and doing cool stuff (Seree Lee -- youtube him).
But Katy Pery or whoever the next anonymous pretty face is will make more money off of one single than someone like a Tony Mac or Vic Wooten or Seree Lee or (take your pick) will make in their multi-decade careers. And that's not new, and digital music isn't going to fundamentally change that.