OP article was specifically talking about Rustbelt as one tool you would be able to use in the future to mitigate the risks posed by the unsafe code you do have

OP article was specifically talking about Rustbelt as one tool you would be able to use in the future to mitigate the risks posed by the unsafe code you do have. But in general, I think that entire idea is that as more code moves to memory-safe languages, the less need we have for unsafe sections. Ideally, once the kernel itself can be written in a memory safe language, everything running on top of that wouldn't need much unsafe blocks. To be honest, this goal is probably decades away, but we should definitely be considering memory-safe languages for systems programming.