Linux should stick to C. If Rust is still around in 20 years, then it can be chosen as a mainstream kernel programming language for Linux. Google Fuchsia's Zirc

Linux should stick to C. If Rust is still around in 20 years, then it can be chosen as a mainstream kernel programming language for Linux. Google Fuchsia's Zircon kernel chose to use C++ over Rust over stability concerns. Best to have an independent cleanroom kernel implementation where Rust can prove itself.