Not likely considering Valve are working on an ARM version of proton in the open...

		hamdingers 5 months ago \| parent \| context \| favorite \| on: Linux gamers on Steam cross over the 3% mark Not likely considering Valve are working on an ARM version of proton in the open, have published test results for x86-64 windows games playing on proton-arm64ec-4, and there are credible leaks that the Steam Frame uses an ARM cpu. If anything Valve is moving towards ARM and taking the library along with it.

Then it will probably happen after they get it polished on Windows.