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In a world where JIT become more and more common, I could see many legacy features being dropped at one point.

Alternatively, I wonder how feasible it would be, for a multi-core system, to keep one legacy core for incompatible processes and faster new-arch cores for running the main beef.

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The current generation of new programming languages are all compiled to machine code (Rust, Go, Swift)

That's an implementation detail. Code written in these languages is generally trivially retargetable.

You could also use some form of pre-compiled-non-platform specific system, which you then compile/optimize to the current platform.

Ideally we should also be able to decompile and recompile code. But this might be hard for x86 die the complexity.

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