What would a new progressive party have to offer, other than "hope" and "change"? People have heard that before, and they are disillusioned enough to know that change cannot be achieved by electing a certain person or party into office. Change means that a lot of people stand up for what they believe in. The fundamentals of the political system need to be changed: Without campaign fincance reform, a real progressive, non-corporate party will never succeed! People will have to "coerce" the Democratic Party to do this, and they will need the media in order to win. Otherwise, there's no legal way to get it done.
The corruption of politics in Washington and its servitude to corporate interests need to be addressed on the largest scale possible. If the people's voice is not heard then, there's nothing else to hope for.