The HP Spectre and Dell XPS series have Thunderbolt 3/USB-C ports, as do a lot of ginormous gaming laptops. I don’t know what the driver situation is, but there are already some interesting adapter and desktop docking solutions available, and I’d expect to see a lot more.
Quite a few of the higher end PCs are adding the Thunderbolt 3 drivers and hardware to their functions because of the much faster transfer speeds. It really is a no brainer. . . and the connector is identical. It merely involves adding the internal hardware and drivers plus licensing the Thunderbolt technology for a couple of dollars per unit. I doubt you'll see it on the $300-$400 cut rate PCs for a long time though.