Doctor Shortage?

The number of medical school graduates has been flat for 30 years, while the U.S. population has increased by 37.4% from 226.45 million in 1980 to 311.256 million today.  As more physicians abandon high-volume, paperwork-intensive practices for low-volume concierge practices, and as more Americans are soon forced into Obamacare, where will the doctors come from?