The goal isn’t to make them less widely used, it’s to make them not OP. Often the latter results in the former, but that’s not the goal. If people still find them to be very useful, great; my issue is that they’re a little too useful.
@Jainus did a very nice, and more extensive, write-up of why Bone Dragon should be nerfed. I think it’s definitely the worse offender. Gorgotha is just annoying b/c it’s so universally useful and makes matches much more of a slog.