It's a trap
There is no way that Linus will allow any rust in his kernel. He will grind it away and apply his zinC based anti-rust coating all over it. The same way he blocked a lot of C++ modules that were being written in the early 2000s.
Unfortunately there is no way you can get people to code is C these days. Maybe C++ but no self loathing tattooed hipster is going to want to touch C with a barge pole, much less any self-respecting one.