There are really few distinctive guitar tones through rock history. Link Wray, Chuck Barry, Harrison, Clapton, SRV, Hendrix, Keef, Gilmore, Brian May, Martin Barr, Andy Summers, and some others were actual tone innovators. But even EVH was distinct because of his playing technique less than his raw tone. Guitars are guitars and amps are amps. There are Fenders/Gibson guitars and Fender/Vox/Marshall amps, and most others are variations on those basic themes.
Rock-Pop music has stopped evolving (long ago) and is harking back to the past. Bands that are guitar centered, like Drive By Truckers, Alabama Shakes, The Record Company, Catfish and the Bottlemen, Bad Flower, Real Estate, The Struts (even the names sound worn) all sport retro, not fresh, sounds. NWOCR is one of the hottest things going right now. What does that tell you? I heard a new song on the radio the other day that started exactly like a 70's classic rock tune with 70's LP/Marshall tones, and then it morphed into some kind of pseudo white-rap thing. Kind of interesting, but complete retread. New release on XRT in Chicago. Stuff is like classic, punky, roots, indie, urban-ish/rap, new country, folksy, ska or Reggae-ish, or a few other well-worn categories.
No new music sound right now. It's not good or bad thing. There is a lot of very good music, but nothing truly fresh. So new guitar tones are really not needed. I'm kind of old, but not talking from that POV. Just a casual observer of the past and the present. Whatever is truly fresh and new probably will not involve guitars or guitar tones, like rap, EDM and other dance styles disavowed guitars. Disco turned its back on the guitar hero. But rap started in the late 70's with disco, half a century ago, and honestly has become no more than one of the most "imitation is the sincerest form of music" styles ever. EDM is about scene, mashup, raving and the crowd experience, and less about music. It's a social movement less than a musical movement.
For music sake at large, I might actually hope that we are actually coming to the end of the guitar craze that began in the 1950's. About time already, right?