America’s colleges and universities are at a crossroads. For all too many students, a college education has become a major economic gamble. Over the past three decades, inflation-adjusted tuition has more than doubled at both public and private universities. Meanwhile, professors are harder to find: tenured and tenure-track professors have gone from roughly 45 percent of all teaching staff to less than a quarter since 1975. In short, students and their parents pay much more for much less faculty time.