Except that go is a garbage collected language and as such will never be a replacement for C++. I could however see C++ dying, leaving C and go behind.
If rust could do that (someone hacked and remove GC), I'm sure go authors will figure something out. Well, guess it all depends on interest on that topic.
What, as the language everyone loves to complain about? Not yet. That's a year or two away, at least.