The big riddle is how do you get the health care costs in the U.S back in line with the rest of the world, which doesn't necessarily have single payer. I'm a big fan of Singapore's public/private hybrid which delivers excellent results for a very low percent of GDP. We spend double as a percent of our GDP on health care vs all other developed nations.
"More than 80 percent of the hospital beds in Singapore are in public hospitals, and those hospitals are cut into different “wards” with different levels of amenities: A-class wards provide unsubsidized care but have single rooms and air conditioning, while C-class wards are overwhelmingly subsidized but are set up like shared dormitories with common toilets. There are a number of ward levels in between, too, all with a sliding scale of comfort and subsidization. So both A-ward patients and C-ward patients are paying for their own care, but the prices they’re paying are very, very different, because the government is absorbing the direct cost of care in the C-wards."
Not saying common toilets are unacceptable but it's things like that which would be a big adjustment/shock to the American system of being used to mostly individual rooms with meal service, etc.