This doesn't make sense for our college system. We do have equivalently high supply. There are thousands of colleges around the U.S., and hundreds of large, publicly-funded ones. Supply is no issue here. However, if we tell people to stop going to college, that supply will dwindle down with the loss of demand... Which won't help costs to those still operating. Same with cutting down on appropriation rates by the state, that's not going to make tuition cost less by any stroke of the imagination. It'll cost more in order to make up that loss.
That's not to say that there isn't fat to trim off in the school system, because there is. There just needs to be a better way to manage that, as cutting funding will raise prices in the short term (if not permanently). What do you want to change about the student loan process to fix this?