Earlier quoted context omitted.
This is the answer. Lenders would then have to do proper qualification on borrowers, would be more limited in their lending, and this would put downward pressure on tuition.
So unsecured personal loans? Those depend on your credit which most students don't have much/any and your debt-to-income which is normally infinite for students because they don't work. You would massively screw over kids whose parents cannot pay/co-sign a normal loan as it would force them to work and study. Also, you normally cannot get very much with such low income and cherry on top, they have awful interest rate…
Or cut out the middle-man entirely and have the government provide college education for free.