We have been considering moving JavaScript into our core curriculum for vocational-readiness reasons. However, our core CS curriculum focuses on concepts that won't become out of date.
There are certain languages that are pure, or close to pure, and lend themselves to teaching certain concepts....
@BenI. Not knowingly anyway. I often install a experiment with random *nix distros. If one uses Zsh rather than sh, Bash, or Csh, I probably would not notice.