How long does Class A have?


Hi Guys/Gals
 I have a Sugden A21SE which is a Pure Class A single ended design, I absolutely love this musical amplifier with its strangely plentiful 30wpc, it runs hots as they do, I always enjoy watching the faces of my uninitiated friends when they touch it after I mention they get hot, lol.
But in this modern green era I wonder just how long do Class A amplifiers have before Greta Thunberg gets wind of this inefficient method of creating sound and pisses on the parade?

Thoughts?
mrmeaner
How long does Class A have? Until the price of delivering electricity sky-rockets, where is Tesla's free energy when you need it?
Oh, and I guess I shouldn't bother building the DIY Audio VFet class A amp I have sitting here waiting to be assembled...
My Duson A10 runs hot too.
https://www.pinterest.com/pin/455567318526910810/
At first I left it switched on 24/7 to spare it the heat cycles and hopefully prolonge its life span. It’s 30 years old now and still going strong but I do switch it off now for energy sake. Also I use headphones on a Bluesound node while leaving the amps off more often, but that’s just being lazy.