This would be great of course, but the reason that 'what actually happens' is so different than 'what should happen' are the usual economic incentives. How can we change the financial calculations to separate formal education from job training in a way that drives the ship in the better direction.
One way could be to regulate degree requirements to only jobs that really require them like engineering, nursing, etc. Another might be allow student loan bankruptcy if certain criteria are met such such as x number of years below y income.