The reason that we won't see a huge shift in the number of low-income students who are attending Harvard and Yale is that the academic expectations are so high that while there are some students who would qualify, the numbers are not huge.

We've seen a sea change, a real shift over the past generation from a system where less than half of students left with debt and now two-thirds leave with debt. Now, it's become the norm to leave with debt -- and often with a lot of debt.

When low-income students are saddled with debt and have a low probability of completion, they end up worse off than if they hadn't attended college at all. You end up in a very difficult situation to get out of -- ever.