I don’t have counter examples, but hear me out.

What if this hegemony in ISAs is partially because of the high costs of porting software and toolchains?

Maybe the next generation of embedded devices will have ISAs that are, say, extremely optimized for real time industrial controllers, but terrible at compiling C++.

It seems a little silly to give up on cross-compilation just because _today_ everything runs on ARM.

Especially because cross-compilation is not a particularly hard problem, the problem is with decades of tooling assuming the build and target environments are the same.