The DLC strategy of lying low and waiting for the Republicans to implode is going to depress Democratic turnout. It's as simple as that. You have to take some risks to thrive in politics. The Democrats have to do two things: push the Republicans off the cliff, and tell America how they would be different (and better).
Not every Democrat has to do everything, but every Democrat has to do something. And right now only a handful are doing anything more than testing the water with thier pinky toes.