Take the private sector out of the student loan program and have government loan at COL levels.
That doesn't solve it.
The problem with the student loan bubble is two-fold..,.
#1 - Loans made to students who have almost no chance of ever paying the loan off, not to mention that many of these same extreme high risk "students" also receive tax dollars for living expenses.
#2 - "Loans for the asking" mentality of the government system provides an impossible to resist temptation for schools to overcharge. They overcharge in two ways - bloated tuition, and bloated class requirements. Guaranteed loans means guaranteed payments to schools....almost no matter what.