I don't know... I'm sure they'd get some, CocoaPods has a very large user base after all. But if GitHub laid out the reasons like they laid out the options to start this thread, I think they'd weather the storm fine and diffuse some people who show up to be angry.
I could see why GH would drop them and think they'd be well within their right and in good moral standing in my book. I just don't think they would unless the maintainers became incredibly hostile or proved unable to fix the problem or even band-aid it. GH just seems too culturally invested in making things like this work to a satisfactory conclusion. I have a feeling that the CocoaPods team will be schooled in a lot of things directly from the GitHub team as they work to resolve the performance issues, just look how informative the initial post was.