LUHE: There is no consensus among US citizens for change re health care that's free at the point of delivery.
There's no perfect system for funding healthcare, and in the US it is a highly-politicized issue. So you have people who can point out the issues with our current system and people who can point out the issues with any proposed systems. And they aren't honest when they're defending their preference, since it invites biased and hypocritical criticism and the discussion devolves into a shouting match.
One issue, as I see it, is that the current system is a Frankenstein's monster of supposed free-market systems that are regulated by government. It's not really possible to go fully in one direction or another, so we end up with a system designed by greedy insurers on one side, and incompetent politicians on the other, and frequently managed by clueless HR departments instead of the individuals and families that need it. No surprise- it's a confusing mess.
I'd rather we had taxpayer-subsidized preventive and basic care available to everyone, with insurance available for the less-common circumstances that often require massive financing. If we can offer life insurance at a small premium, we should be able to do that same for people who need extensive hospital stays, emergency services (surgery, etc), and long-term recovery care. It's still not a perfect system, and it doesn't fit neatly in any one political party's platform, so it won't ever happen.