Uh, I think they will! A few people will just keep running older versions forever, but anyone who wants a modern Mac operating system is going to be out of luck once Intel support is dropped next year.

Intel-based Macs were fundamentally commodity hardware. You can buy AMD GPUs which are very close to what Apple shipped. Select the right components, add a few software patches, and everything just kind of works.

By contrast, you can't get an Apple Silicon GPU. And on ARM, macOS doesn't support software rendering at all. Graphics alone are going to kill any future Hackintosh prospects, because even if you can get Darwin to boot on your ARM laptop, you won't be able to display anything.

An an aside, Apple never seemed to try very hard to kill personal Hackintoshes, I really don't think they cared. Now it's going to happen incidentally.