Let the Rust folks go off and do their own kernel project(s). If they can come up with something feasibly better, it will be adopted and they can displace the current C-based Linux kernel. Based on what I've seen of Rust and the crowd that has taken to it, this does not seem a likely outcome. (Worse yet, maintainers are dropping Rust packages for practical reasons.) Still, they should try so that they can see for themselves while leaving the current developers to their existing affairs.
Like parents separating two fighting children, both sides of this need to be pulled away and kept separated. The Rust crowd can go off and have their own project(s) and the Linux kernel can continue being only C-based. And never the twain shall meet. If the Rust crowd manages to build something better, it will replace the alternative. If not, they need to accept the reasons why without pleading to social media masses. We've seen PipeWire come along and replace PulseAudio. We've seen X11 keep a stronghold over Wayland. To the Rust crowd, focus your energy on building something somewhere else that you feel is better. To the Linux kernel developer crowd, it's time to move on from this experiment for everyone's peace of mind.