Rust is a very useful and pragmatic language, and probably the best one in its niche. I don't think you have much to worry about. As things stand right now, it's not going anywhere.
Rust is steadily rising on Tiobe, currently #44. It will get there.
Ahead of Elixir on the chart, to my surprise, pleasantly.
Down-voted, haha. It's not an insult or criticism of Elixir, simply my preference for Rust. Delicate people :)