The Linux graphics stack in a nutshell, part 1

Well, if future GPU architecture turns out to be drastically different from contemporary GPU, sure, there might be a lot of impedance mismatch between Vulkan and the HW.

Then again, it's hard to imagine OpenGL with all its implicit state and fundamentally single threaded architecture, being a particularly good match to any conceivable future GPU architecture either, despite being a somewhat higher level interface than Vulkan.