I think Anthony is spot on with millennials looking to form a musical identity. I think it's just part of the cyclical nature of music and trends in general. The music of the 1980s saw the synthesizer becoming a lead instrument and guitar taking much more of a backseat. Nirvana and all those 90s rock bands pushed back, and guitars became popular again. Now we're back on the digital instrument cycle. The key difference this time is that hip hop has become a heavier part of the pop music landscape. Guitars were never the lead instrument in hip hop, if featured at all. Since that's the "big prism" through which much of pop music gets filtered these days, guitars don't always make the cut. Sooner or later someone will start a very popular rock band again and guitars will probably be important for a while until Elon Musk designs a synthesizer and then we just go in circles forever.