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.
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.
I know, but many people obviously don't know that, so it might be a bad name. Just label it LanguageChange or Incompatible.