How long does Class A have?

It seems likely, or possible, that mixed Class-A, A/B and Class-D could serve out three or 4 channels of sound to Tweeters, MR and woofers.
But that would likely happen with speakers that are powered and have some DSP to serve as the basis for an active XO.
However the Hypex Class-D plate amps and the recent Purifi Class-D, would examples of Class-D aps that could be seen as obviating most of the Class-A advantages.

The size of the Class A hifi audio amp market literally doesn't move the needle on global environmental impact and the earth's carbon footprint. Much more lower hanging fruit for any activists or policy interest groups to go after first - most obviously a move away from fossil fuels and on to renewables.  It would be much more meaningful to power our societies (including our Class A amps) with offshore wind, solar, waste to energy, etc power sources.  Anyone who cares about policy would be taking this approach and not targeting individual devices.

I hear you, and obviously the vacuum cleaner market is larger, and I’m not sure of your whereabouts but in the EU we had the power of vacuums, lightbulbs etc targeted quite tightly, I just think someone will come along and pick on them, I hope not mind.