The saving grace for take up and could be DX12's downfall is microsoft decided to make DX12 windows 10 exclusive, this leaves a large market of people on older operating system's that vulkan can be targeted at only been up against the older weaker DX version.
Personally I think linux wont catch up due to how small its share is but any improvements in API on mobile and windows will probably at least help linux a bit so that will shrink its gap I think.
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