Lots of laws get proposed and most never pass. Often they’re proposed just for political posturing/to score some political points.
But let’s pretend it passed. Would med schools lower their tuition if suddenly their students can’t take out the full cost of attendance? Unlikely. More likely is they either:
1. Only admit students who can pay the full cost
or
2. Start their own institutional loan program and loan money directly to the students. I’d actually like to see all colleges/universities take this approach as they’d actually have an incentive then to make sure graduates get and hold down jobs, offer additional education/training if their graduates get laid off, etc.
Right now there’s almost no accountability on the part of the university, and all the risk is taken by the government (ie., taxpayers). Yet the university gets to dictate how much its educational goods cost? This is a giant part of why the cost of attendance has gone up way faster than inflation.