[readittwice]

Maybe, however remember that you then need to buy new hardware to use new WASM features.

Also WASM isn't really ideal for interpretation, this could make implementing the CPU harder (however I have no clue about implementing CPUs, so this is just a guess).

What would be the advantage? Performance? Probably not much after JIT compiling WASM to native machine instructions. If there is an actual problem there, I guess it would be better to just add new native instructions that support WASM semantics. The JIT can then use these instructions if available.

Right now WASM can't do much without a runtime, so I think a WASM-only CPU is probably infeasible for some time.