Rust forces users pay certain kinds of debt upfront that makes Rust attractive for rewriting, but I don't think it's that much attractive for greenfield projects. You'd want to fight your problems, not your problems plus Rust. On top of my head right now I couldn't think of any famous Rust projects which aren't a rewrite.
Personally I don't think Rust is that hard to learn and some of my side projects are being written in Rust. But if I ever had a business with Rust as a main language, I'd be worry I could find enough Rust programmers. Fortunately the community is addressing its ergonomics and hopefully one day its approachability and learning curve will also gain more attention.