The supply of physicians is artificially limited by Medicare funding for residency programs at teaching hospitals. This shortage will only get worse as the population ages.
The corporations running America's hospitals and health systems are fully aware of this problem and have lobbied state governments to give physician's assistants, nurse practitioners, and in some cases even pharmacists the same powers as doctors. Depending on your state, you'll find an NP or PA where you might have expected a doctor 10 years ago -- places like urgent care clinics and standalone ERs.
https://www.ama-assn.org/education/gme-funding/save-graduate...