Developers are already moving
More and more of the active developers on the project use git for all or part of their development efforts. This has lead to a minor amount of friction because all these ways are not standardized, have fit and finish issues when pushing the changes into subversion, and cause friction. The friction is somewhat offset by the increase in productivity they offer these developers. The thinking is that having git as source of truth will unlock the potential of git even more to increase productivity.