Beyond the Wayland details, Steve did mention that at least internally they had been discussing the possibility of supporting DirectX on Linux outside of the Windows/WSL2 scope:
We have consider the possibility of bringing DX to Linux with no Windows cord attached. I'm not ready to discuss this at this time... but in the hypothetical that we were do this, DX would be running on top of DRI/DRM on native Linux. We likely would be contributing some changes to DRM to address area of divergence and get better mapping for our user mode driver, but we wouldn't try to shoehorn /dev/dxg into the picture. In that hypothetical world, we would essentially have DX target DRM on native Linux and DX continue to target DXG in WSL to share the GPU with the host.

https://www.phoronix.com/scan.php?page=news_item&px=Microsoft-DXGKRNL-Uphill-Battle