It now it seems likely that arm64 will do the same to amd64.
In the 90’s, after all, aliens were coming to Earth to steal Intel’s chips.
Granted, the Intel CPU at the high end is pulling 250W+ (or was it 300W+?).
There are places for both architectures. I don't see x86 going anywhere unless Intel folds and ceases to design chips. Not sure AMD could power on alone given their current market share, though I certainly hope they could as a user of their chips in the desktop (and conversely, an M2 Air for my laptop).
A minor quibble—high end desktop is a niche almost seemingly intentionally(?) ignored by ARM. Ampere puts out interesting server chips, and Apple puts out interesting laptop chips. What a high end desktop ARM chip? Apple’s max and ultra chips maybe, but they are pretty clearly a compromise with the fact that that market is pretty niche.
The A18 launched with the iPhone 16 was also supposedly beating Intel single core as well.