I read the article and the main reason for moving is wish of Guido and some developers personally. I was following the pep for Kallithea and hoped it will be picked up given Python is using mercurial which is already distributed and at par with git in features and workflow.

Also GitHub is another sourceforge, when Python did not move to sourceforge when 80-90% of developers were using it. I don't see why they want to move to GitHub just for source code management now when roundup will still be self hosted by Python. This is one of the reason I like gnu and gpl they not just build open source but continue to uphold the principals.