Yes I want this a whole lot and think about it often. Today Rust does not quite fulfill all C use cases, and I think this is a big part of it. I want there to be an identifiable subset of Rust that is C-ABI compatible (possibly that means no generics), and I want MIR to be a multi-language IR. Please do that!
Ownership can provide a great foundational model to build other computing systems off of, and more languages are going to incorporate ownership concepts in the future. Having them speak Rust helps guard against competition from 2nd-generation ownership systems.