Which is definitely true. Maybe not APU low-end, but if it doesn't fit $200 and up graphics cards, then I agree it's not going anywhere.
Again: in games.
I tend to agree, and I would include APUs.
To give some context to this, as the RTX2080Ti was introduced, it had just been the 10 year anniversary since the introduction of the ATI 4870 graphics cards.
It was produced on 256 mm² worth of TSMC 55nm, had 1.2TFLOPS at stock 750MHz clock, and 115GB/s memory bandwidth and a hair under one billion transistors.
Ten years later, the RTX2080Ti is produced on 754 mm² worth of TSMC 12nm, has 13.5GLOPS at boost clock of 1524MHz, 616GB/s memory bandwidth and 18.6 billion transistors.
So in ten years, we have managed to increase FLOPs less than four times per mm², (and bandwidth hasn't doesn't even come close to keeping up with ALU capacity.) Ah, one might say - but todays GPUs do more than the GPUs a decade ago, comparing FLOPs alone is unfair! And that argument would have some merit (as would comparing bandwidths though for a less optimistic prognosis.). Ultimately, what determines your computational resources is the number of transistors. And that increased 6-7 times/mm² in the last decade. So, looking forward a decade to 2028/2029 where would we be? Well, insofar as a desktop GPU can be called mainstream at all in 2028/2029, lets give it 200mm² (because cost/mm² is rising), which is roughly a fourth of the RTX2080Ti. And if lithography advances at the same pace as the last decade (it won't) such a mainstream chip would offer us roughly the same FLOPS performance as todays RTX2080Ti, or up to 50% more transistors depending on your favourite unit of merit.
Only, of course, the likelyhood of lithographic advances over the next decade being as strong as during the last is very very low. It just won't happen. So the above is an extremely optimistic scenario. See you in a decade for cashing in the bets. ;-)
I can't help saying it again. Ultimately, the yardstick any new proposed methods of rendering is going to be measured by is efficiency. If efficiency isn't there, lithography won't bail you out. Those days are over.