Given how you've been able to do this, I'm interested to hear your thoughts on Apple removing support for 32-bit code?
That way it can be emulation all the way down, and you get binary compatibility forever with minimal ongoing engineering cost. The performance would be atrocious if not for the fact computers today are faster than 1980's computers so it really doesn't matter.
It also means more users using more emulated binaries more frequently, which can make the hardware’s battery life and performance seem worse than they actually are, especially to less technically inclined users who don’t know the details but notice their laptop dying a lot faster than it should.
If they don't really care, they're going to put the minimum possible effort on a separate 64 bit version too and it'll be just as inefficient anyways, except with no backwards compatibility.
Meanwhile I imagine most of the software people might want to run is 64-bit x86 anyway; 32-bit x86 is these days really only a thing you care about for old games, which is pretty esoteric. If Wine can be made to support it then that keeps the support load limited to Wine.