I think you are misunderstanding what I'm saying.
I'm not arguing whether single payer is a good idea. I'm not arguing that it's tantamount to communism. I'm not arguing that there are many politicians (Obama, included) who are in favor of it. I'm arguing about the feasibility of it in light of naive statements.
It's easy for a politician to endorse a policy, particularly a populist one like Medicare for All. It's entirely different to craft a policy, within the current system, that pragmatically implements it.
My claim is that Obama endorsed the idea because he both thought it was good policy and populist idea that worked in the favor of his politics. But that's entirely different from crafting a pragmatic policy that actually can get passed into law.
I think he's been on the record stating that he didn't like the ACA, but the goal was to pass something, even if it's broken, to try to force it into policy so that it would eventually be fixed into something better. So with so much support, why can't the U.S. implement it? That's central to my point.
"President Obama was clear that – while he would have preferred single payer if we were starting from a clean slate – it would be too disruptive given our current system."[1]
Point being, in many ways it is against the current system. So while you haven't directly addressed my questions, I get the impression you think "Just expand Medicare" is the answer. My point is that it's a bit naive because it really doesn't address the systemic effects that have kept single payer policy from already being implemented.
Medicare/Medicaid is on track to be the largest proportion of the entitlement budget, before expanding it and it doesn't count the Dept. of Veterans Affairs budget (I don't think healthcare is a bad way to spend the budget btw). I know many people will say the Defense budget can be cut to pay for it. But how do you plan on getting that passed when nearly every senator wants to protect the DoD jobs in their state? I'm not even against that idea, I'm just not seeing you advocate a real strategy to implement it. The U.S. is perpetually running against the debt ceiling and your proposal will exacerbate that. This is just the beginning; how do you address the medical insurance industry, particularly when they are heavily lobbying Congress?
If the answer was "Just expand Medicare", it probably would have been implemented already but the fact that it's not should tell you something: maybe it's not that easy. So my question is not whether or not you think it's a good idea, my question is how do you get from the current state to your goal of a single payer system?
[1]https://washingtonmonthly.com/2015/09/13/obama-the-negotiato...