Yes, I'm sure rust is amazing but, Just a guess that the number of programmers that can contribute to a rust project is probably 3-4 orders of magnitude less than the number of programmers that can contribute to a JavaScript project. Well, maybe if you subtract all the "competent enough to a submit a coherent pull request" programmers the number is only 2-3 orders of magnitude?

Basically I'd assume, if a project targeted at JS, switched to rust, the number of useful pull requests would be 50-100x less.

I wonder if anyone has any data on that (and similar projects re-written in C++ or Go etc...).