Well I would say it could happen any number of ways.
Hypervisors, emulation, Linux or new emerging fields like Openboot custom firmware. Even new equipment.
Personally I think we could start with Linux. These days you can run VMs on a machine and so I think we could maybe run macOS on a Linux hypervisor of sorts. That would be a logical step for current PC owners if support for Intel based chips is dropped in the near future.
Thanks to the great work done by the Asahi Linux guys, a lot is now known about the ins and outs of the Apple Silicon chipset. If you have the time this is an absolute worthwhile read on what's been discovered so far >
https://asahilinux.org/2021/03/progress-report-january-february-2021/
One amazing thing gotten from the above article is the engineers at Asahi Linux have found out the internal workings of the M1 like the connectors and layout tables of the Apple M1 chip itself (of what controls what) through the use of reverse-engineering and some clever workarounds. That is an amazing feat in itself. Because they have mapped out much of the internal workings of the M1 chip, it should make development easier. The chief engineer at Asahi Linux who developed the Linux Apple Silicon bootloader came from way back when he developed the security firmware and loading scripts for the Nintendo Wii, which eventually became a useful part of BootMii for the Wii homebrew OS field.
Also m1n1 bootloader (which is used to boot Linux into Apple Silicon). Maybe that could be used with our future builds? Also as Linux gets ported over to macOS, we may see new areas of development emerge for a more seamless setup.
New physical platforms may also emerge if/when devs manage to find a way to get macOS to work with other ARM chipsets or boards. For example I heard China already has mainstream PCs with ARM chips in them like the Tianjin Phytium. >
https://www.tomshardware.com/news/arm-phytium-ft-2000-cpu-chinese-gaming-pc
The Samsung Exynos platform is also likely such candidate for an alternate setup. According to Asahi Linux, despite Apple Silicon not sharing the same architecture as other ARM chips/platforms the M1 still shares a lot of the same underlying structure including the use of the I²C chips and bus with the Samsung Exynos (which has its own history with PowerPC architecture). Exynos is the only platform that retains the closest similarity to Apple M1 in terms of system architecture. Exynos laptops with AMD gpus are already coming onto the market so I would think they are next possible step.