Earlier quoted context omitted.
This could be done, of course. But how likely is such an approach to succeed? It would effectively create a new language and in turn to a new ecosystem. Why not just use a different language (Rust comes to mind) then?
Sure, but that's a different issue. If it doesn't gain traction then the decisions made by Google are clearly considered the best approach, at which point what relevance does the openess have?
I don't think this is necessarily true. There are a lot of fuzzy factors that go in to making a language successful and it's tricky at best to get these right, even if openGo was a better language.
As a practical example, go effectively has one person who's full time job is keeping the testing infra happy. It'd take time and money to establish this in a go fork and going without it would make development of the fork much harder.