i personally think we should make federal loans highly progressive, both in amount and interest rate, and make them dischargeable via ordinary bankruptcy proceedings (also, revert the bankruptcy-tightening laws that were passed in the mid-oughts). that would be something like loans for 100% of tuition, room & board for those from families under median income (~$68K in recent years) smoothly varying (but not linear) down to 0% for those above 3× median household income (~$200K). same for interest rates: risk-free rate (~2.5%) for under median to market rate for unsecured personal loans (in the 10-20% range) at 3× median income. anyone above 3× median will likely have an established banking relationship somewhere to be able to get private loans.
this would put downward pressure on tuition, while still meeting the objective of providing opportunity for the less privileged majority. same goes for loan forgiveness--make them highly progressive based on recent earnings/wealth (including unrealized gains).