Earlier quoted context omitted.
Sure, every situation has its shortcomings, possibly even big sucking chest wounds which don't help. But my point was that if multiple systems, some of which seem different (US vs EU), all with different apparent wounds, appear to fail in the same way at the same time, maybe there's something that's common among them which is the actual cause. Perhaps it's just a coincidence. But which is more likely?
I would argue they're not failing in the same way though. The US system is "failing" in the sense that health services are not available/affordable to all. The NHS has issues with funding and staffing. France has issues with supply chains. Any system will have flaws, but just because no system is perfect it does not mean that all are imperfect in the same way.
This will be a large investment (if doubling the training budget produced double the graduates that would not be enough), and will NOT bear fruit until those people actually graduate, which is 6 years minimum, and mostly 10 years away. So for 10 years, it means paying through taxes while getting minimum to no improvements in return. Furthermore, such a large increase is not possible at short notice, even if the money is available, so it will take more than 10 years time.
For research one might take profit margins of large pharma as an indicator: a fully nationalized, but equally capable, pharma research system would cost some 15% less, assuming nationalizing introduces zero inefficiencies. BUT that money would have to come from taxpayers directly through the government budget.
And nobody is looking for 15% reduction in drugs costs. That just won't move the needle enough. So in reality the government would have to increase the drug research budget to make drugs cheap.
Failing to do this will mean medicine becomes less accessible to people, regardless of whether we switch to a single payer system or not.
So let's get real here: we will fail to do this, and it will get worse.