This is the first I've heard this concept labeled. Yet, "Doom Loop" seems to be fitting.
If we are speaking in generalities or on a macro level as suggested, I would agree that US Airways could be viewed as a traditional major that is in a Doom Loop. Not to get into specifics, but they remind me a lot of TWA. I always thought both of these carriers did not have the foresight to alter their business paradigm, so to speak, to adapt to this always changing industry.
Of course, this is a very general statement to make. But then again, we are talking in generalities.