I agree that you should calibrate the excitement for a new language like rust appropriately. But I think it goes to far to say that rust advocates are amateurs. Many are professionals that have a hobby project or three in rust, and like what they see so far. Surely some of these hobby projects will grow up.

Rust isn't just a redo of C++. Rust introduces some important new concepts that I think will stand the test of time, even if rust itself fades for whatever reason.