Interesting read. My 2 cents is that tubes remain very special and perform in ways solid state does not. How can a 60 year old tube component best a top of the line modern SS? I suspect tubes will be around and in demand by discerning consumers for a very long time.
Don't sell your tube amps
Although this was an article in a guitar Magazine, I thought it might interest those who own stereo tube equipment:
https://www.premierguitar.com/gear/amps/dont-sell-your-tube-amps