So who does that leave? Linux, Android and Stadia? And maybe Nintendo? There is about as much not supporting it as are.
You can use vulkan on Mac and iOS using MoltenVK.
As a rendering engineer, I have lots of doubt that those vendors will move away from their proprietary APIs, they provide significant advantages, and from anecdotes from around the industry, I think this state is preferred by engineers in AAA development, which I think is where much of the forces in the industry come from.