[ssivark]

Julia hasn't "taken off" but I venture that it might be "getting there" with recent improvements in being able to generate (relatively) compact binaries.

More generally, I wonder whether the future of software development will be less enamored with new/upstart languages, and more amenable to languages with truly novel offerings which have also had decades to mature. Beyond Julia, OCaml, Erlang/Elixir, and potentially Scheme / Common Lisp are a few of the others I can think of.