Erlang (or Elixir) are absolutely Go replacements for the types of software where CSP is likely important.

Source: spent the last few weeks at work replacing a Go program with an Elixir one instead.

I'd use Go again (without question) but it is not a panacea. It should be the default choice for CLI utilities and many servers, but the notion that it is the only usable language with something approximating CSP is idiotic.