The boat has already sailed, but it's GCd languages and not Rust that replaced most usage of C and C++ in systems programming. Rust is nibbling at the remaining niche islands of C/C++.
In some way, you could say that Zig is pulling system programmers towards high-level programming, whereas Rust is pulling high-level programmers towards system programming. That's not a watertight comparison but I think it's an insightful one.