Who said anything about GitHub? The situation would call for a highly specialized, custom-made solution. If you think that's impossible, please share your reasons for thinking so. Comments like yours are pure FUD and aren't in any way helpful.
5 karma · joined February 6, 2016
Insert a layer of expert representatives (akin to congresspersons) to generate the PRs?
Making the system resilient doesn't sound like anything more than another engineering problem to me.