They, whoever they might be, have been trying to duplicate the sound of tubes in guitar amps for over 50 years. It will never happen. Law of physics: tubes operate at relatively high voltages in a vacuum, produce heat and sound the way they do because of the interaction between the anode and cathode in a given circuit and its said voltages. The natural compression and harmonic distortion incurred is what we all hear and love. No solid state device comes close.
Nothing wrong with you liking tube amps, or worrying about what the electric guitar enthusiasm experience will be like if tube production ends one day.
But Your stated view of what’s good and right in the world of tone seems like it could stand to be broader, and allow for more of a range of different tastes rather than assuming everyone shares your own. Even if such broadening were to occur, it doesn’t mean your own tastes have to change.
Some people get sounds they like with no tubes in their signal path, and even without using some imagined or recalled tube amp sound as an initial reference point. Attempting to mimic a tube amp with tubeless equipment is entirely absent from some people’s creative process.