The USA has problems it cannot afford to resolve because the people with the money can afford to block solutions.

That may be true in a lot of cases. But the effort to transition to single-payer isn't one of them.

We don't move to single payer because there's no way to do it that won't negatively affect a whole lot of people. Not just people with money. Millions of millions of voters. You either negatively affect the medical providers, you negatively affect the taxpayers, or you negatively affect people with above-average insurance with above-average employer shares. All of those groups are massive numbers of people.

All the talk about what we "should" do doesn't change the "is" question. Because our health care sector has grown to 18% of GDP, switching to single payer can't be achieved without denting the rice bowl of millions of ordinary people.

So regardless of what the people with the money do (and there's lots of people with money who push for single-payer as well), that barrier to change will still be present. And sufficient to stop any conversion.