Since Go 2 is never going to happen, maybe it's time to rename the "Go2" label on GitHub and remove the "Go 2:" prefix in the template for language change proposals. I think this confuses people into believing that Go 2 is a thing.
Based on the discussions I've seen, Go2 is considered to be the name for the process of extending the language, not an exact release version.
With that said, the label seems to “work” by allowing people to first think of a backwards-incompatible way to solve a problem and then, possibly, arrive at a much more compatible solution in the process of discussion.
