Class D amps seem poised to take over. Then what?

I have had some good class D ,I still feel a very good class A, AB 
sounds more fluid .I hav3 a Coda CSIB integrated  and it has much more. Control ,and depth of performance IMO. Spotted 3,000kva transformer ,and over 80k uf in capacitance  runs in pure class A for almost 20 - 1st watts and pure class A preamp ,even my dac runs in pure class A on the analog outputs  I am good with my Amplification I think it just has more depth, some class D like Merrill sound very good but Waay over priced ?

I had a tube amp in the late 60s/early 70s (HH Scott 222c, still have one), a Sony TA-3200F (first 'super amp', still have it) and multiple others. Now I find myself using a number of TPA-3118 based class 'T' amps (D with a few mods as you know) since I have a 4-way with a mono sub, requiring 7 amp channels to quad-amp (rest of the system is on 2 desktop computers). They sound incredible and eat hardly any power, not that I focus on the latter. My only concern was phase effects on the tweeters, what with the RF filter, but since I correct measured phase deviations on the 'crossover' computer's filters anyway it doesn't matter (and there's hardly any anyway). Scoping tweeter waveforms requires some amplitude to overwhelm the residual RF (rough on the ears) but that's the only drawback. Sound is crystal clear, and it's amazing to see tiny chip amps driving big Altecs and horns (though they're exactly what they should be driving, being efficient). Big speaker doesn't mean big amp.
I see/hear nothing with these little amp boards that's inferior to what I've seen/heard over the years through my heavy, hot old amps, which I still love. Quite amazing really.

"Rocks might melt, the sea might burn."

It'll be the end of the world as we know it.

fuzzy one:  many performance car drivers use ultra high performance summer tires which CANNOT be used in cool temps, requiring the use of winter tires which make a huge difference in handling.  I personally use ultra high performance all seasons and winter tires, also a huge difference.

earlflynn:  I have a NAD M33 with the latest Purifi amplification.  Have not had a single issue and it runs extremely cool and has great sound.  What NAD units are you referring to?