In just over a decade the United States will need 130,000 more doctors than medical schools are producing. So says the Association of American Medical Colleges, which warns of a doctor shortage that will drive up wait times, shorten office visits and make it harder for Americans to access the care they need. The road to Obamacare has seen its share of speed bumps, as well as big potholes. But a physician shortage is unlikely to be one of its roadblocks. Shortage forecasters point to two major factors. One is an aging population.