I think Go has a long way to (forgive the pun) go before it can really start to compete with the entire Erlang ecosystem. Only having a modest knowledge it both, Erlang is still built around stability. Hot code patching, an extremely instrumentable VM, the whole OTP framework, simple networked Actors. Erlang was built with telecom in mind.

That's not to say they can't inhabit a lot of the same areas, but Go's area of interests will probably remain somewhat separate from Erlang.