In that case interoperability with Go libraries might be better: just running on the same runtime wouldn't bring many advantages (other than having a single GC instead of 2) without being able to easily call libraries written in another language.
(Although TBH I'd run them as 2 separate processes and have them communicate via some form of RPC, OCaml would just need good integration with <insert-favourite-GO-rpc> protocol)
Agree. If Ocaml add 10 more users, it would more than double its users in the world. Also it is never too late to remind everyone again that JaneStreet uses Ocaml. If Go were any good JS would have used that.