The fact that Go is still on Go 1 is a testament to how well the team has been able to introduce backwards compatible changes. Changing versions just because a lot of progress has been made doesn't make sense.
I think the language is fine as is. If anything I just want some rewritten packages in the std lib. I’d love to see what an http/v2 or sql/v2 would look like without the baggage of backwards strict compatibility. No more f() and fWithContext().