As a long time pro guitarist I can say for certain that class D will not be replacing tube guitar amps for those who care about tone. I’ve tried various modeling amps and others including those with tube front ends, and the necessary distortion characteristics from a tube output stage aren’t ever likely to be replaced by class D.
@wolf_garcia If you play guitar then you know how heavy a Fender Twin is when loading out of a club at 2:AM.
Class D was not ready for prime time when all those junky ’modelling’ amplifiers appeared some years back. But there are class D modules available now that are quite musical. For those guitarists that don’t rely on overdriving the output section of their amp to get their ’sound’, the idea of a 100 Watt amplifier that allows the sound they have/want that only weighs 15 pounds is attractive!
I play in a band and when I meet guitarists from touring bands, if they find out who I am this is something they ask for. Since I’ve heard class D amps that sound for all the world like an excellent tube amp, I see class D in the guitar world as inevitable- its only a matter of time at this point.