I've said nowhere that all of Android should be written in Rust. I've only said that had this specific component been written in Rust, the issues wouldn't have shown up. Of course the code base is old and predates Rust.

But I think this vulnerability serves as an important lesson about which language to choose for new projects in the embedded area. Thus I'm very glad that Google uses Rust for its new OpenSK security key firmware. I hope that future versions of Android will adopt Rust, at least in newly written components. Some Google developed Android related projects are already using Rust, like Cuttlefish which uses crosvm.