Make them all take Dave Ramsey’s personal finance course. Prevent them or their spouses from obtaining a loan for anything until their student loan is paid in full.
Unpaid student loans are going to cause the same catastrophe that the subprime mortagages did, therefore Congress needs to stop the insanity. No more loans to 18-year olds with no collateral whatsoever but the promise to pay when and if I can.
Make the universities guarantee repayment if there is a default. Take it out of their endowment.
Change the student loan system so that the university must cosign the loan, and the student can discharge in bankruptcy.
Colleges will then stop admitting unqualified students, and stop offering majors which do not lead to jobs.