>>The Bazaar (or "bzr") version control system lacks the visibility of systems like Git or even Mercurial.
Sometimes projects just run out of steam because something else has caught wind. Having worked on projects that have had their moment and then their sunset it does take some time to adjust and move on.
With the rise of Git and related things like GitHub maybe it makes sense for Canonical to cut their losses and migrate to what appears to be a solution that more developers are happy with. They could always try to see if their "must have" features (whatever it is that keeps them using Bazaar other than familiarity and the cost to migrate away from it) could be things that could be integrated into Git.