To my knowledge, SPIR-V on Intel will stay, and be it only because it’s part of the OpenCL and Vulkan standards.

Yeah talking about the (vendor-preferred) compute part here

Vulkan's SPIR-V dialect is substantially different from the OpenCL one, notably with the former having structured control flow. They're incompatible between each other.

Yes, unfortunately. Otherwise we could just implement all of SYCL and OpenCL on top of Vulkan and live happily ever after.