This article only reveals that Democrats fear a possible pargadigm shift which will leave them out in the cold for decades, just as Republicans had been for 4 decades. Now they call it a dismantling of the two-party system. It is actually the dismantling of the New Left.
The New Left figure that the "washed-up and impotent" Republicans lie on the ground and keep taking their hits. They can't imagine the Pubbies would bite back.
I can't imagine their hyperbole if Republicans dismantle the two-party system for real.
They just change their name to "Progressives" and hope that'll entice voters to head down their path. (Notice how much Dims have used that term in the past few months.)
I get a mental picture of these so-called Progressives at a crossroad. They can choose to go left or even further left. Karl Rove is at the center of the path and while they decide (that is, use focus groups) he nudges an issue out to the center and that trips them up. They end up going off the deep end. :-)