Or towards clean energy generation, storage, and use. How fast would oil and coal be completely replaced? And again, money pumped into the economy to do so.
Or scientific research, space projects, could make large leaps, and again, that money flows back into the economy and multiplies.
Instead we want to make it so the people who hustled through college, picked a cheaper school, worked on the side, paid down their debt if they got any as soon as possible, that those people get the same outcome as someone who got a huge loan and played video games and got drunk every weekend, and spent $200,000 on a degree that only gets you a $50,000/year job?