In reply to Piet.

@Alec Kinnear You act as if I'm actively preventing it somehow.. Well, I'm not. The SVN system has simply been around for longer than git or Github. I'm not planning on adding git support to it, but others certainly can if they wish. The plugin and themes repos have undergone a number of changes over the years, and perhaps that sort of thing will be added one-day.

As for GitHub support, I'd say that seems unlikely. More likely is simply a git mirror, like is already done for core and bbpress and such: https://make.wordpress.org/core/2014/01/15/git-mirrors-for-wordpress/