I think doctors know as much if not more than anyone how broken the system is and how it constantly fails people, disagreements more about what to do about it and fears about change.
And there’s certainly some physicians organizing in support of single payer.
A lot of doctors are concerned about how much say or influence they would have in such a health system, but hey not like they have much as it is as everything has become giant conglomerates run by MBAs and private equity, so not much to lose. At least government is theoretically beholden to the people.