I doubt those vendors really want to retrace their steps to go through the multi-year pain and many committee discussions that brought us SPIR-V, again. Look at

I doubt those vendors really want to retrace their steps to go through the multi-year pain and many committee discussions that brought us SPIR-V, again. Look at all those names on the SPIR-V specification. Do you want to waste all those people's time, again, for that many years? Nobody inside the WG but Apple wants WSL.