US salaries for healthcare are the best on the planet, period.
The comparison (and to be fair, this is a very high level) paints an extremely clear picture:
United States $313,000
Germany $163,000
United Kingdom $138,000
France $108,000
Per: https://www.worldatlas.com/articles/countries-with-highest-p...
So yes, I absolutely want to see how many physicians stick around if you tell them "your salary will now be half and we're maxing our your workload". Alternatively, I want to see how long the State's finances last if they say "we'll pay the national market rate for your services and we're now maxing our your workload".
And even then I don't want 10 years, I want a generation or two. Even pre-COVID we had multiple surveys indicating that 60-70% of doctors would not recommend becoming a doctor. I want to see how that number changes as States run their experiments.