What if colleges and universities waived tuition and fees for medical school students in favor of collecting a percentage of their income later?

Health Blog has a nice discussion of this idea, proposed in the American Journal of Obstetrics & Gynecology earlier this month. The goal is to reduce  medical students' debt load -- about $145,000 for public-school graduates and $180,000 for private-school goers -- thus opening the door to more would-be doctors and allowing them to more freely choose among specialties.