I will be curious to see what happens with Github as well. I suspect many are already adding their open source projects elsewhere. In fact, it might be smart for one of the blockchains (cough cough Steem) to create a platform to host an opensource repository to make it all immortal on the blockchain. Microsoft may own the repository, but they do not own the work placed on there. Just time to spread it out now so they can't destroy/limit/alter what is there currently.