A question I got repeatedly the last couple days was, now that AARM (Apple ARM) is a thing, is the ultimate ARM-Intel-PowerPC Universal Binary possible? You bet it is! In fact, Apple already documents that you could have a five-way binary, i.e., ARM64, 32-bit PowerPC, 64-bit PowerPC, i386 and x86_64. Just build them separately and lipo them together.
You’ll be able to eventually build a binary that contains code for every Mac hardware and software platform starting from Classic all the way up to macOS Big Sur, and from m68k all the way up to ARM.
I doubt anyone will use it, but that doesn’t make it any less cool.