>>128392607 (OP)
As a "genre", it's fading out for reasons akin to any kind. Tech makes it easier to program beats, sample something, or fiddle with tones until something "sounds right" regardless of whether someone knows anything about playing an instrument, so that right there guarantees a move away from styles that require learning a stringed instrument or drums.
The other factor is just how long a style or group of styles proliferate. Sonic Youth was significant in the 80s and 90s, and you saw, correspondingly, any number of groups aping them. The following generation will find that boring or as ground already thoroughly tread and try to strike out doing something else. There will obviously still be groups or figures trying to throwback to something (The Strokes, Ariel Pink, Mac Demarco, Ty Segall), but that taste always waxes and wanes. And as groups retire or their members die off, the tendency to ape them falls off.
Styles can also be exhausted. After groups like Sonic Youth, Polvo, U.S. Maple, etc., what are you really going to do that's fresh and exciting with that sound after a certain point? Newer groups will always be anxious and sometimes judged as just being a rip-off of some earlier group.
