It would be cool if they could use a bot to help guide people posting pull requests. I'm sure there's a lot of cool ideas to play around with in that space.
They don't accept pull requests on Github, for what it's worth.
I think that's precisely the point. The bot would usher them to gerrit, with some pointers on how to interface with their systems. And it'd then close the pull request.
Since PRs can't be disabled on GitHub, it seems inevitable that they'll be getting them submitted.