Those who think that ACA repeal makes single payer more likely

The history of health care politics in systems you'd like the USA to emulate doesn't show it.

First, most systems developed incrementally, covering more people or more categories of people until all people were insured. There aren't many, in fact, I can't find any examples of incremental coverage being withdrawn or repealed and that leading to universal coverage.

The one step forward, two steps back, then three steps forward to single payer nirvana is fantasy, not reality.

Second, the single payer form of universal coverage has some justification, but let's not make a fetish of it thinking that all or most countries would do the same. Most countries with systems that are of the highest quality didn't develop purely out of a desire for single payer. Furthermore, most of the systems seemed to develop based on what was created incrementally in the country itself.

There are many great health care systems out there that aren't single payer. They're all more heavily regulated than ours, but the point is you can get there multiple ways. You don't have to make everyone sign up for Medicare or Medicaid, at least not in the short term.

And that leads to my third point, these systems in other countries often developed over decades, sometimes many decades before covering all that they cover today.