[dagw]

Well, for instance, TIOBE has Rust at #34, below such mainstays as ABAP, COBOL

Do you believe that to be incorrect? I think you're probably underestimating how widely used those languages are in massive, "boring" companies around the world. Rust may be the new cool kid, and may even be the future, but the number of companies around the world that have adopted Rust for anything significant today is minuscule.

It has Groovy above Ruby.

Again, Java is everywhere, and many Java shops have added Groovy to their workflow where it makes sense. Ruby is barely used outside a small of number of tech companies.