One clear answer is ARM. The X1 totally smashes, even the zen 3 in IPC, that's for the <10W X1. Imagine what a 100 W part would be able to produce. The new arm firestorm cores developed by Apple will probably be able to emulate x86 applications faster than what x86 processors are being able to produce natively. The first actor to release an arm CPU for desktop, developed with support for SATA, pciex, DDR 5 memory and so forth, they will be able to grab a huge market share over night. Ok might be a bit dramatic, but with firestorm, we have what, a 60% higher absolute performance than Intel's best desktop chips, but at 5 watts. Now we're talkin again! Only thing left is for Windows to do the same as Apple, get great AArch64 support and get it done fast. I want my next gaming rig to be 300% faster than the former, not 26%..Oh I 100% agree with that. Sadly regarding CPUs & GPUs appears all the easy performance gains have been used and none are left.
We need something radically different to move forward at those gains again. Maybe some kind of light/fiber optic instead of electricity, maybe (but unlikely for the foreseeable future) it will be quantum computing. Who knows. Only thing that is known is what we have will likely be here for a long time.