Rust has a larger ecosystem, but it's not even on the same planet as ocaml in terms of expressiveness.

Kind of disappointed facebook didn't run with ocaml, instead of doing the whole Reason thing. They could have been contributing to and using ocaml directly, instead they decided that programmers will freak out if there's no curly braces.

That's how I think things will go too. I really enjoy the time I spend with OCaml but whenever I need to do something I use JS because it gives me the frustration in lower doses if that makes sense. I learn less but sometimes I don't want to learn, I want to do.