Rust is probably better than C or C++ for writing an OS ... however it has some behaviors that don't make it ideal. Rewriting the OS in Rust will perhaps simply have to start over again when some frustrated OS devs go off and make an even better language for writing the OS.
Heavily augment the OS in Rust is a much more believable effort. The main architecture can be in C and then all the utilities, misc functionality, etc can be in Rust. This is also kind of what Rust was built to do (heavily augment a web browser already written in C++).
Finally, my money is on the far future having most OSes built with multiple languages. Each one specializing in what is required for the given domain. It sounds like Windows is already taking this route (iirc Windows 8 and 10 have some drivers (probably usb) written in the P language).
OSes are important enough for our society that I think it makes sense for us to put some extra effort into their construction. Several custom languages and 50ish years of calendar time to get an output feels like it's going to be worth the cost.
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