Rust is gaining momentum at a decent pace IMO. It's not necessarily a web technology so expect slower adoption but still it's been steadily growing.
And honestly, I've been toying around with an Actix web server written in Rust, and the experience is not bad. As someone new to Rust, the main pain points have been along the lines of figuring out how to type a parameter to accept both a database pool and a database transaction (which turns out to be quite hard to figure out). Other than that kind of friction, the experience has been nice.
If you want to try out rust for web, check out this project: https://github/wulf/create-rust-app