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
Class A like rock n roll will never die! My Esoteric A-03 is competitive with all but the most extreme level amps. Will eventually run them in a mono/block set up.
I have A, AB Tubes Solid State, D, A-D and I love them all.
Prefer my Audio Hungary X200 though I do enjoy my Bel Canto REF600M's in the game room.

Reviving this question as I have thought about this over the last week.... and then....

I was thinking of selling my my Karan Acoustics KA M900 Mono blocks....pure class A to 900 wpc (1500 4 ohms) and going to one of the Aavik class D amps. Then Aavik comes out with their flagship integrated, the I880...200wpc pre class A...if Aavik is making their TOTL amp class A, it must be for good reason so I'll keep my monoblocks!