It's the one thing we have going for us.
As the Republicans are more successful implementing their policies and thereby widening the gulf between the extremely rich and everyone else, it becomes increasingly difficult for them to argue that their policies are good for most Americans. In fact, the last 30 years are a direct refutation of virtually EVERY economic argument they make today. Also, as Republican policies lead to higher unemployment and therefore greater dependence on the government, the popular Republican refrain "get the government out of your lives" sounds much less catchy to the ordinary person.
This really an inherent problem facing any powerful elite seeking to capture the levers of government within a relatively free, democratic system, but it's also the main reason hard-right policies always eventually get rolled back by popular protest -- usually before they can be made permanent. Their drastic results speak for themselves.
It is also ironic how the very conditions created by conservative policies tend to mute the importance of those once-powerful cultural and foreign policy wedge-issues that conservatives always run on in more prosperous times