Indeed, and I think we can also make better use of the "lesser" medical degrees as well. For instance I get most of my primary care from a nurse-practitioner or physicians-assistant. My parents' most beloved primary care "doctor," who is an absolute superstar, is a nurse-practitioner.
Maybe there could be some kind of a continuous work-and-training ladder, where you start as a NP, and move your way up as you get more training and practice. Or you can stop whenever you think you've reached your desired level.
Other countries do just fine with much less.