The US has had "Medicare for some" since 1965.

[csziggy]

24. I agree with doing it incrementally, but I think it needs to be from both ends

Cover children and young adults while lowering the eligible age.

It is getting more and more difficult for young working adults to get a job that includes coverage - that is why the ACA allowed parents to keep their children on their policies to age 26. So as young people get jobs, cover them so they start out knowing they will have health coverage. Covering children reduces the costs to parents in marginal jobs without any coverage and will tend to push those parents to wanting coverage of their own.

Reducing the eligible age allows companies to keep experienced workers without increasing their costs - and same as covering children and young adults will increase those who have problems getting coverage and those who will add to the support for a national health service - no matter what it is called.

No matter who is covered, allow supplemental policies so those who can afford it (or the companies that employ them) can get better coverage without taxes paying for "cadillac" policies.

Those who like their policies (and doctors) can keep them - of course, the insurance company may decide to change their accepted practitioners or the company they work for may change their insurance company and which providers are in network - same as now and before the ACA.