Will the US be facing a doctor shortage?

Wall Street Journal:

Experts warn there won't be enough doctors to treat the millions of people newly insured under the law. At current graduation and training rates, the nation could face a shortage of as many as 150,000 doctors in the next 15 years, according to the Association of American Medical Colleges.

[...]Proponents of the new health-care law say it does attempt to address the physician shortage. The law offers sweeteners to encourage more people to enter medical professions, and a 10% Medicare pay boost for primary-care doctors.

[...]But medical colleges and hospitals warn that these efforts will hit a big bottleneck: There is a shortage of medical resident positions. The residency is the minimum three-year period when medical-school graduates train in hospitals and clinics.

There are about 110,000 resident positions in the U.S., according to the AAMC. Teaching hospitals rely heavily on Medicare funding to pay for these slots. In 1997, Congress imposed a cap on funding for medical residencies, which hospitals say has increasingly hurt their ability to expand the number of positions.

Medicare pays $9.1 billion a year to teaching hospitals, which goes toward resident salaries and direct teaching costs, as well as the higher operating costs associated with teaching hospitals, which tend to see the sickest and most costly patients.

[...]While doctors trained in other countries could theoretically help the primary-care shortage, they hit the same bottleneck with resident slots, because they must still complete a U.S. residency in order to get a license to practice medicine independently in the U.S. In the 2010 class of residents, some 13% of slots are filled by non-U.S. citizens who completed medical school outside the U.S.