Nuke, smoke, flame, faire, maya, modo, baselight, resolve are all on linux.

ILM, pixar, Dreamworks, Weta and SPI are all pretty much linux only shops.

Free desktop apps I assume you mean - there's a plethora of high-end VFX desktop apps available on Linux.

Yes, Linux along with the traditional desktop will be the future for the whole creation process, while consumers will shift to other interfaces and devices.