[coldtea]

>Surely the number of eyes looking at that codebase will vastly diminish though?

I don't think the "many eyes" theory ever panned out. There are projects used by billions, and on which thousands of other FOSS projects work, and only have like a handful of people working at the codebase (and less catching bugs)

>Also Google have golang, which I'd imagine would be their target now, not python 3 (for migrations)

Not really, Golang was never Google's official/mandated language. Just a language some Googlers made with Google's use cases in mind. Google still uses C++, Java, and Python (plus some Dart). Some things use Golang, but not in some top-down "Googlers shall use Golang" way.