Oh, plenty of people listened. Means tested divisive claptrap that gave private corporate a free pass or a way out to keep screwing people over. Look at how well Obamacare played out - people being mandated by law to pay for health insurance with no mandate to make adequate care accessible, so you would have plans with $5000 premiums. And yet Obama goes around going "yeah, we have so and so many American insured," which is not the same thing as "access to care," and never was, and never will be.
Democrats never concerned themselves with getting to the root of the problem. Wonkish, "big data," overly complicated and needlessly divisive faux-meritocracy trash for policy, depressing the vote as they refused to listen to the average person's problems, and then liberalism acts all smug like they did nothing wrong as they lose time and time again, from 2010 to 2016. How the hell do you people not realize this "Party," if you can even call it that anymore with how much they've lost, is out of fucking touch?.