ARM-based Macs are going to be a pain if they're as locked down as I suspect they might be. But damn are they likely to be fast if the rumours in that article are true. 8 high-performance cores on a next-get chip when Apple's A-series chips are already beating intel chips in single-core performance.
I suspect ARM compatibility will be a problem for ~6 until major software houses get themselves sorted out. Most open source software already has ARM support anyway. And of course it's possible that Apple will actually include some level of hardware support for x86 emulation.
The windows ARM has intel simulation. In fact Apple has done simulation/emulation/recompilation/FAT-obj for the last few transition. It would be the same. The problem is even if it stay the same many do not change (like Adobe etc.) which drag it. Hence, might as well move on.
I suspect ARM compatibility will be a problem for ~6 until major software houses get themselves sorted out. Most open source software already has ARM support anyway. And of course it's possible that Apple will actually include some level of hardware support for x86 emulation.