First off, thank you for your service in that sector.So my concerns for "resistance" are this - payers that are for profit, insurance companies, have enormous resistance. As a worker in the healthcare industry, the insurance industry as a whole, including Medicare/caid, is the worst. They literally make healthcare decisions for people as a superior authority over doctors, which is the real kicker. The idea that a doctor can think you need one thing, and the bean counters saying, depending on how much they wish to profit, that you need less. I have never worked in single payer and while I'm sure they don't just float blank checks to anybody with an MD after their name, I imagine the not-interested-in-profits aspect really helps out tremendously. I'm not anti-capitalist for things like electronics, cars, furniture, kitchen sinks, trading cards, or.. many things. But not having a fancy set of silverware won't outright kill you unlike a lack of healthcare (or poor quality healthcare.)
So I guess the question becomes how does any proposed system help the worst person among us. Unemployed, disabled, no-skilled human. Homeless guy on the sidewalk. What can they do when they need care?
I think homeless deserve access to care as well. Ideally, what would happen under a revamped ACA system is that when someone who is homeless or has no permanent address is admitted to the hospital, a social worker at the hospital would help to connect with outside local social workers who help get that person into Medicaid as well as other social services so they when that person leaves the hospital, they can collectively assist them in gaining employment and an place to live not in the shelter system.
About the resistance, remember that a lot of disinformation to about ACA made people extremely resistant to it and it actually cost Obama his Democratic majority in Congress. I'm concerned history could repeat if a single payer system is pursed now.
Improving the ACA is less risky.