Funny how one of the arguments against Medicare in the 60s was that providers wouldn’t accept it.

Turns out when you have the choice of accepting lower payment per patient for Medicare or having a lot fewer patients, you choose the lower payment per patient.

I would expect the same situation here. Doctors would grumble, but no one would force them to accept patients on whatever “Medicare for all” would be called. Nothing other than market forces.

A number of things would probably have to change, including the cost of medical school. But the system right now is expensive and essentially unsustainable. So change is inevitable.

Nope. More and more providers are dropping out of Medicare, or imposing limits on the number of Medicare patients that they're willing to see. It's tough to sustain a financially viable medical practice on Medicare rates, especially for primary care in HCOL areas. Medicaid is even worse. There are a lot of patients who nominally have coverage but in practice are functionally uninsured because they can't find a local doctor to take them on.