As far as I can tell, this only applies to new Macs which most of which will be Apple Silicon-based. Nothing is stopping us from using iMac20,1 for the forseeable future, and if necessary, spoofing CPUID. In fact, z590 is already working with Comet Lake on Hackintosh (see:
Ohchang's build: Gigabyte Z590 Vision G + i7-10700K + AMD RX580(partialy iGPU accelerated) | tonymacx86.com). The challenge going forward will be the changes Intel will make to x86 (Alder Lake's hybrid architecture, Rocket Lake's new Xe-based iGPU), and how those new features will interact with macOS.
But there may come a time when Intel x86 is no longer supported on macOS, and at that point, hackintosh (on new OSes) will be challenging, but who knows if a general purpose ARM-based chip (that can be hacked to run macOS) will make it to market.
But I have a feeling that Apple's future M-series based Silicon will be sooo compelling and so hyper-performant that they will blow Intel out of the water and many of us won't want to have a power-hungry hack anymore. What's the point of spending $$$ to buy an Intel chip to run macOS slower than spending that same $$$ on an M-series actual mac?
We'll see what Intel can do with Alder Lake, then Meteor Lake, and then Lunar Lake.