I think it likely that Apple will just ramp up what they've been doing so far - make an "M1 Ultra" that has 32 or 64 or even 128 cores of CPU, at least that man

I think it likely that Apple will just ramp up what they've been doing so far - make an "M1 Ultra" that has 32 or 64 or even 128 cores of CPU, at least that many GPU and scale the memory and I/O in the same way. Put the one with fewer cores in the iMac Pro and the one with the most cores in the Mac Pro. Every couple of years when they upgrade again every product they make will go up to M2, then M3, etc. etc.