I work for a company that uses paid Github, and it's the BEST THING EVER. We will be happy to keep throwing money at Github well into the future. We just outgrew the "platinum" plan ($200/mo), but they have plans all the way up to "aluminium" (with an I) (just over $1000/mo).

They don't suck and we're enormously happy. As the sysadmin whose job it would otherwise be to manage Gitorious or Gitlab locally, I am delighted to be able to outsource this task.

So yeah, I'm extrapolating from anecdote but for the moment I think their prospects of continued payment for services are pretty good.