Yes, I have been trying to make that same point. Unfortunately, a significant portion of the liberals have been just as much dupes of the divide-and-conquer strategy as those they detest on the other side. They merely use their left knee when knee-jerking to Party. This is what enables the duopoly to maintain control and to prevent any real progress towards democracy, peace, or the public interests.
A progressive left must offer some new leadership that is outside the party lines. It would use the only tools we have left: that of our ability to organize and use economic power. It must rise beyond mere “click democracy” and must go well beyond mass marches. It must strategically use & organize boycotts, labor actions, and more. These could become springboards for the rise of a genuine opposition party.
Such a movement, and any organization(s) that spring therefrom must be eternally vigilant and diligently non-partisan, resisting all attempts to make of it an extension of the Democratic Party, as has seemed to happen to some among the self-proclaimed “Resistance”.
It must be focused on issues, while consciously avoiding falling into the very liberal-vs-conservative labeling & framing that triggers emotional overrides of reason and self-interest.
There are examples of success on a smaller scale for such a vision and strategy. I have been personally involved with some. I believe it’s possible and high time to do this on a broader scale.