This is something that's up to the community really. The PyPy developers early on made a new FFI that is also available for CPython, sadly not entirely as easy

This is something that's up to the community really. The PyPy developers early on made a new FFI that is also available for CPython, sadly not entirely as easy as the classic API but completely functional and if there was a push to rewrite extensions to use that FFI (or provide dual-paths) then the gap could be bridged.