Rustaceans at the border

I'd also like to point out, nearly 100% of the code in the kernel already gets downloaded from an external repository: Linus' git.

If there were actually the proper infrastructure in place, useful rust crates could be pulled down as sub-gits or whatever along with firmware and everything else. Whether it's a good idea to auto-mirror new versions from crates.io, or how dependencies should be handled is an open question, but downloading a ton of code when you start to build a kernel isn't a new idea at all.