I see GitHub accessible to our team all day yesterday and today as well. A news appeared that some of the sites where unblocked after the offending material was removed and the websites complied to the governments ask.
If your release and branching is based on Git and all the work you did resides there, it becomes difficult to switch horses mid stream.
If your open source contributors and have accept pull requests then the history gets lost.
Repo isn't centralized, its distributed amongst Github not across systems (Github to Bitbucket or Cloudforge etc.)
As Dave Thomas in his talk http://www.infoq.com/presentations/metaprogramming-ruby says "Java is for average programmers - a scissors with blunt knifes" If somebody wants to learn now, its good to go after the future market which would be dominated by mobile, apps on cloud. The programming trends is poised to be move towards a mix of Functional + Object Oriented, Procedural. JVM will still be around, as its battle tested but will be programmed by something else (Scala, Clojure seems to be picking up). Golang/Dart will be a deadly combination as well. HTML5 Mob Apps will pick up steam. We choose Scala, Golang, Ruby(scripting), Ruby on Rails for our tech stack at http://www.megam.co