Student loans were dischargeable in bankruptcy prior to 1976. (See where the above tuition inflation graphic starts.) They haven't been since. Do away with that, and no sane lender would lend $200k unsecured for a college education. Few parents would be able to produce the funds, and tuitions would, of necessity, need to fall.
Bingo, except that tuition would never fall low enough for most working class parents to afford them. But the loans are federally guaranteed, so the lender would have nothing to lose even if defaulted on. But you’re right. Student loans should be dischargable in bankruptcy just like credit card debt. Both, after all, are uninsured. It’s just that simple.