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After a raucous debate lasting nearly a year, the Democrats are united on health care. But that unity does not include a call for a single-payer “Medicare for all” health system.

“This campaign is about moving the United States toward universal health care and reducing the number of people who are uninsured or under-insured,” Sen. Bernie Sanders (I-Vt.) said Tuesday in endorsing his rival Hillary Clinton, the presumptive Democratic presidential nominee.

Sanders did win a few health care concessions in the negotiations leading to the endorsement. Clinton more funding for community health centers and access to a “public option” government insurance plan, which she has supported in the past.

But on Sanders’ top health priority —  plan — there was not a word. At the meeting over the weekend, an amendment to add a single-payer plan to the document was defeated.

It wasn’t much of a surprise.

Most health policy analysts — including those who are sympathetic to the idea — say moving from the current U.S. public-private hybrid health system to one fully funded by the government in one step is basically impossible. And that’s making a huge assumption that it could get through Congress.

“To try to do it in one fell swoop would be massively disruptive,” said Paul Starr, a professor at Princeton who was a health policy adviser to President Bill Clinton.

The U.S. health care system, said Jeff Goldsmith, a health care consultant and health futurist, is “the size of a country — it’s bigger than France — and it employs 16 million people.”

In moving to a single-payer system, he said, “you’re talking about reallocating $3 trillion, reducing people’s incomes and creating” in effect a single entity that would set prices for all medical services. Single-payer supporters dispute the idea that getting from here to there could not be done.

“We’re so used to such a complicated system in the U.S. that we envisage any change would be incredibly complicated as well,” said Steffie Woolhandler, a physician and one of the founders of the single-payer advocacy organization . “But what you’re doing with single-payer is actually simplifying the system.”

For example, said Woolhandler, “the latest data is U.S. hospitals are spending 25 percent of their total budget on billing and administration, and hospitals in single-payer nations like Canada and Scotland are spending 12 percent.”

But while a single-payer system would undoubtedly produce efficiencies, it would also bring huge disruptions. Said Starr, single-payer supporters “haven’t worked through the consequences.”

One of the biggest is exactly how to redistribute literally trillions of dollars. The problem, said Harold Pollack, a professor at the University of Chicago, is that the change will create losers as well as winners.

“Precisely the thing that is a feature for single-payer proponents is a bug for everyone who provides goods and services for the medical economy,” he said, since their profits — and possibly their incomes — could be cut.

And it’s not just the private insurance industry (which would effectively be put out of business) that could feel the impact to the bottom line. Parts of the health care industry that lawmakers want to help, like rural hospitals, could inadvertently get hurt, too. Many rural hospitals get paid so little by Medicare that they only survive on higher private insurance payments. Yet under single-payer, those payments would go away and some could not make it financially. “You would not want to wipe out a third of the hospitals in Minnesota by accident,” Pollack said. “And you could,” if payments to hospitals end up too low.

There are also questions about how feasible it would be to have the federal government run the entire health care system. “It’s hard to be nimble” when a system gets that big, said Ezekiel Emanuel, a former health adviser in the Obama administration now at the University of Pennsylvania. “No organization in the world does anything for 300 million people and does it efficiently.”

To try to do it in one fell swoop would be massively disruptive.

Paul Starr

The politics of Medicare — which serves roughly 50 million Americans — already make some things difficult or impossible, he said, pointing to in which doctors and patient advocacy groups blasted a proposal to move to a more cost-effective way to pay for cancer drugs. “You already can’t do certain things in Medicare because of the politicization,” he said. ”When you cover the whole country, it would be a lot of gridlock.”

Pollack agreed, and pointed out it’s not just the health care industry that could revolt. When the Affordable Care Act was rolled out in 2013, he said, “the people who couldn’t keep their old plans — a very tiny number as a percent of Americans” . “We saw how difficult that was and  when that promise wasn’t kept. Now imagine the major shift we’d have to do to move to a single payer system.”

There’s also the question of whether it’s simply too late to go back to the health care drawing board.

Single-payer supporter Woolhandler insists it is not. “Other nations have gone to single-payer systems,” she said. “It usually can be done in about a year.”

The last industrialized country that did the switch was , in the mid-1990s. Taiwan, however, with its 23 million residents, has a population larger than New York and smaller than Texas, and had no existing private health insurance system at the time.

“What I’ve often said is we could have done this in the 1940s when Harry Truman proposed it,” said Starr, who has on the history of American health politics. “Health care at that point was probably about 4 percent of [gross domestic product] and there existed at that time a relatively small private insurance industry.” Today health care spending in the U.S. is of the nation’s GDP and the private health insurance industry accounts for half a trillion dollars per year.

Both Starr and Pollack, however, said it would be possible to make a switch, although it would have to be carried out over a very long period of time.

“You could imagine some kind of long transition, where you gradually expanded Medicare,” said Starr, “for example moving it down to age 55” and then in later years continue to lower the age threshold.

But even if the U.S. did manage to execute a single-payer system, said Pollack, it would likely prove problematic, particularly in how it would be financed.

“The major value of a single-payer system would be to help the bottom third of the income distribution, and that means the top 20 percent of the population will have to pay more,” he said. “I’m actually in favor of that, but let’s not kid ourselves. That’s a knife fight that’s going to be had.”