I don’t think Rust will (at least not in current form). It’s breaking too much ground in the (real world) PL-design space. We just don’t know what really work yet!
Eh; sum types, everything-is-an-expression, and composition over inheritance get you very very far toward optimal language design. Sure there are some potential economic improvements that could made to Rust, but the foundation is so strong that I don’t see anything that makes those same design decisions supplanting Rust. More likely that a new Rust edition would incorporate those kinds of changes.