I'd rather see a new kernel optimised and written in Rust from scratch rather than dragging the legacy skeletons around and also bringing the vulnerabilities with us.
> On compilers, we would like to mention all the work that has been going in GCC Rust (a GCC frontend for the Rust language) and `rustc_codegen_gcc` (a `rustc` backend for GCC). The latter now passes all `core` tests, and the former is now working on traits. We continue to track their progress as they may become the best way to have GCC-built kernels with Rust support enabled.
Writing a new kernel with all the capabilities of Linux is an absolutely enormous undertaking, billions of dollars worth: "it would cost approximately $14,725,449,000 dollars [...] to rewrite the existing code." -- https://en.wikipedia.org/wiki/Linux_kernel#Estimated_cost_to...
let's outsource it, so we can cut the cost by half, at least
I just saved 7 bilion dollars and probably need to become manager
30 years later, there'll be a kid in university somewhere about to send a thoughtmail that says "I've written a version of..."
There is Redox, which was intended to be practical, but I'm not aware of much public interest in that. Phillip Oppenheimer blogged about one too, I think, but that's explicitly academic.
That'll take a momentous amount of effort and it'll take 20 years to get close to the adoption Linux has today. I'd rather see if we can improve Linux in that timespan.