Git does not require a singular centralized repository and embraces decentralization. I like how hosting your own repository is embraced by the overall design of git. "Host your own Github" should most definitely be the norm vs having a github/sourceforge/google code that everyone relies on being up. I wish that everyone running their own repositories while pulling directly from others was the defacto standard, that way no one can use the excuse "$repository / $service is down I'll submit it later".