I wonder how much a blow this will be for Vulkan on Windows. idTech was always known for strongly preferring the Khronos 3D APIs over Direct3D and the fewer native Vulkan games are released on Windows the less pressure there is on the GPU vendors to fix and optimize their Windows Vulkan drivers.
Windows as a platform might become irrelevant, but the convenience and robustness of the Win32+D3D API combo for game development simply has no equal on Linux (except Proton of course). I trust Valve and the Proton team to have a fallback plan though. The desktop Linux community (if it can be called that) is too fragmented to come up with a solution. In this case more centralization (of development efforts) would be a good thing. But I don't see native Linux ports taking off for at least the next decade. Proton is just too good for that to happen ;)
