They've been writing drivers and such for years now and they've indeed levelled up the tooling integration. Your original post said along the lines of "if linux is to survive". Even if it was a full rewrite in rust (not going to happen) then it's still be Linux, with the same leadership. Most users wouldn't be able to tell the difference.

It'll take decades for Linux to have everything re-written in Rust. Even then it'll take even longer for every machine to run RLinux.