Providers with billions of revenue could easily afford to fund slots. They'd probably even benefit financially from it.
So refurb gave a reason for a bottleneck, and now we need to figure out why providers apparently aren't taking steps that address it.
I don't know enough about how hospitals operate to understand why that's a good/bad idea.
All residency slots naturally go to US medical school graduates.
Check visa requirements for doctors: http://m.shusterman.com/jwaiversfordoctors/
"International Medical Graduates (IMGs) must pass the the U.S. Medical Licensing Examination (USMLE), complete a medical residency in the U.S. and become licensed in a particular state in order to qualify to practice medicine in the United States. Often, IMGs obtain J-1 visas to come to the U.S. to do their residencies and fellowships. If so, they are compelled to return to their countries for a minimum of two years once their training is complete"
Doctors have huge lobbying power in their union the AMA