The progressive establishment has moved in a direction that, while enriching our lives immensely overall, left millions of people behind.
Ok, I'm not sure about this. What precisely have progressives done that has been more harmful to working types more than, say, the unrelenting campaign within the Right to weaken labor unions (granted the causes for the demise of labor unions are more complex than this, but it's not the progressives who have sought to weaken them). If the =policies of the Right are enacted into law, the pain among the working class will grow in the form of loss of access to affordable health insurance and loss of other social benefits, among other things Conservatives have not proposed anyting productive, that I'm aware of, that would materially improve the lives and economic prospects of the working or umemployed poor/vulnerable.
I concede the point that millions have been left behind, what I question is that this is the doing of progressives, more so that of the political right, or globalism more generally (which BTW, the Right has traditionally supported more so the the Left).
I do, however, agree with what I see as the underlying point here, which is that, as a nation, we need to think long and hard and attempt to integrate those left behind back into the 'mainstream' economy. I do fault Hillary and the Left/progressive in the most recent Presidential campaign for ignoring this, and I think it may have helped cost them the election. Whether any policies will do anything to actually help these folks (and I'm reasonably certain nothing Trump has proposed so far or is likely to do in the future will do anything to improve their lives and are more likely to make their lives worse), what they seem to care more about (judging by the election) is that, at the very least, politicans appear to give a damn about them. Were I the a key advisor to the Democratic Party, reconnecting with this demographic (whatever it is) would be a top priority for me. Not just lip service, but actual, serious thinking about this issue/problem. It's bound to get worse before it ever gets better.