I'm assuming the reality that systemd's API will eventually wheedle its way into most other Debian components made the decision for him. Swapping out Gnome for

I'm assuming the reality that systemd's API will eventually wheedle its way into most other Debian components made the decision for him. Swapping out Gnome for Unity is a lot easier for someone downstream of Debian than continuing to maintain Upstart in the face of Systemd will be.