Rust already supports kernel programming, that is what Redox is. You can do async networking today on stable with tokio and futures or on nightly with futures-a

Rust already supports kernel programming, that is what Redox is. You can do async networking today on stable with tokio and futures or on nightly with futures-await and prototype async/await syntax. You can do GUI programming with gtk-rs. Its pretty unlikely anyone is going to take on the monumental project of "write a software GUI kitchen sink suite like Qt, but in Rust" any time soon. Not because you can't, but because such projects are by their nature at minimum millions of LOCs.