You absolutely right! You can imagine what Google can do with his resources when even one programmer writes his own OS, file system, etc on Rust - https://github.com/redox-os/!
I try to say when you use a good programming language with a really cool compiler which can prevent a lot of errors you can be very efficient and don't lose most of time in debugger!
I think he meant that if one guy developed Redox in his spare time, surely it wouldn't be too hard for a Google team to "simply" rewrite Fuchsia in Rust.
