Implementing public medical systems was a struggle in every country that has done it. It’s not just insurers but also health care providers who will end up getting paid less negotiating their rates with the government. All public programs displace private ones. Municipal garbage collection is a pretty popular service, but before it existed there were people who wanted their garbage picked up and people who were willing to do so for money (I don’t have historical proof but I feel extremely confident saying that).
I feel like a lot of the American healthcare debate is basically focused around a group of people saying that America should never try to do anything hard again because Americans just aren’t up to it, and much of the American public nodding along. I’m with Warren with her: “I don’t understand why anybody goes to all the trouble of running for president of the United States just to talk about what we really can’t do and shouldn’t fight for”. Implementing public healthcare is a tough task and Warren and Sanders both know that, they just aren’t afraid of doing hard things.