Just because the loans can't be discharged in bankruptcy doesn't mean that borrowers actually make good on the loans. That's why interest rates haven't fallen much. However, the fact that these loans can't be discharged in bankruptcy is why student loan interest rates remain far below credit card rates despite the fact that these types of loans have one key feature in common - neither is backed by physical collateral that can be seized to cover the remaining loan balance.
I do hope you don’t think current credit card rates are anything but usury.