Because there is a strong possibility that anyone who ever had a health risk would migrate to California and bankrupt the system. Meanwhile, given the extra taxes needed to pay for it, anyone feeling healthy would move out.
The reason even Obamacare doesn't work very well is because countries that have successfully implemented universal health care have taken away the rights of individuals to opt out. Most of us, in countries running those programs, understand that we get less out of the system than we put in. Until we need it (which, btw, is precisely the very notion of an insurance model).
Meanwhile, a side gain is also to limit the massive paperwork needed to manage enrollment ("ugh, keep the sicks out!") and claims in the US. In the California hypothesis, that paperwork would be replaced by lawsuits and/or administrative challenges whenever California tried to ration care for recent arrivals.
It's simple economics - and common sense - that make universal health care work *
(though not necessarily in poor or corrupt countries). Not politics. That's why even right wing studs like Boris Johnson or Orban still run these programs.
*
within limits: ageing populations stress these programs, massively. But, in the US, thanks to gray power, Medicare still stresses taxpayers. To the tune of $829B in 2021.
p.s. Simple economics is based on the US spending more per capita than other countries. For comparatively bad outcomes. I would expect tax-watchful, but politically neutral, individuals to be able to work through the implications of this math.
Rest fully assured: any health care providers that are part of that gravy train can be expected to strenuously object to rationalization that would bring costs in line with the USA's peers and near-peers.
p.p.s. No, provincial/regional management of plans in some countries doesn't change the fact that the availability of health care is present nationally and the funding often carries a sizable central component.
Update, from comments: There was no federal medical system when Tommy Douglas introduced the Saskatchewan Hospitalization Act in 1947. This was not a universal system, but I think it was close enough to counteract the "people would just move there for medical care" argument.. Possibly, but I would still worry, a lot, if I were doing this in 2024, in California, at current healthcare costs and procedures, much higher population mobility, with the current CA deficit and with an aging population.
p.p.p.s. "But the poor get covered through Medicaid!" misses the point that its coverage can be sub-par when compared to the more egalitarian European or Canadian universal plans. And tying coverage to employers can be economically bad both by keeping workers in suboptimal jobs and the financial burden to employers.
All these undesirable characteristics remain with a California homebrew. Which, as another answer points out, would only be improving things for 6.5% of hitherto-uncovered people, at very significant costs, making rejection whenever such bills are proposed unsurprising.
Let's finish up with why this bill failed the last time it was presented:
(Feb 2022) California Democrats Kill CalCare, a Single-Payer Health Care Proposal | The New Republic
CalCare was murdered like Caesar: betrayed by its ostensible allies, all of whom participated so that none of them could be fully blamed.
Why the betrayal? Because the bill was a nonstarter for California’s most powerful business groups. The California Chamber of Commerce led a coalition of 122 business groups in opposition to the bill. Opposition was the most vehement from the groups representing Big Health Care
This is the pro-bill side, complaining. Is it incompatible with the analysis above? Not really: the current providers would have much to lose if moving to a less wasteful model, comparable with other countries.
And their own link pointing to those dastardly Brutuses:
(Jan 2022) Calif. Chamber of Commerce Announces 122-Member Coalition Opposed to Single Payer Health Care Proposals
In their letter, the coalition points out that similar past proposals have been estimated to cost more than $400 billion annually, which is a financial commitment four times that of Medi-Cal. "Successfully standing up a new function that would be twice the size of the existing state budget is highly doubtful, given the state's recent experience with benefit delays and massive fraud in the unemployment system," the letter states.
More recently...
(Jan 2024 this time) California single-payer healthcare faces doubts from Democratic leader - Los Angeles Times
A legislative analysis of that bill (note: the 2022 version) pegged the cost between $314 billion and $391 billion in state and federal funds — a sum that is larger than the entire state budget Gov. Gavin Newsom proposed for the 2024-25 fiscal year: $291.5 billion.
The proposals usually wind up dividing Democrats and withering due to concerns over cost, opposition from private insurers and the complex bureaucracy that undergirds the nation’s delivery of healthcare.
And since numbers matter with budgets, let's work through this math.
- 314$B cost, lower estimate
- 39M pop * 0.065 : currently wo coverage
- $123k / person => how much it would cost to implement this plan
in the interest of transparency: how is that estimate costed? Per year? For the first 5 or 10 years (as sometimes done with budget projections)? Permanently, with an endowment fund to pay for it? 123k/yr/person seems absurdly high. None of articles I saw were all that clear.