It would be a smart business decision. A Google mid-tier employee or two just isn't a large cost to keep a project running. It's not cheap, sure, but to have a product running at scale?

The rationale for developing Go is that Googlers are fresh out of school and only barely smart enough to program Java, so I think they’ve eased off on the notion they only hire super-geniuses.

I think it's more that they're smart as hell but know very little or have poorly developed taste. So you have to give them a short leash otherwise they'll hang themselves with it through over-engineering and accidental complexity.

The literal quote from Rob Pike is "They’re not capable of understanding a brilliant language but we want to use them to build good software. So, the language that we give them has to be easy for them to understand and easy to adopt.".