really it's only the Fedora based distros that have switched, along with a few others, but for every other one that has switched, a non-debian derived distro can be pointed to that hasn't switched.
RHEL may or may not switch in the future. The systemd people will say that it will switch, but we'll see how the datacenter admins that RHEL is built for respond (they don't need many of the desktop based features of systemd and are are both more comfortable and more likely to have odd init stuff that will be affected.
As for Unity vs GNOME, as GNOME3 was released, the distros have splintered like a glass thrown onto concrete. Yes Unity is one of the fragments, but it's far from the only one.
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