As an outsider, my guess is not "bad contributors" or "diversity" like sibling posters but an increasing perception that Go is a Google language and not a community language with how events have played out in scenarios like the package management work where a replacement for what the community was doing came seemingly out of nowhere despite the community trying to work with the core team

Note: I could have facts wrong but this is the general impression left which is just as important for respondents on this survey item.