The thing is, education doesn't scale infinitely like that. The bigger the class size the less attention you get from the professor, the less individualized the education is, the more generic it has to be, the lower the common denominator, etc.

And lots of colleges are known for their teachers. You can't always just hire another identical teacher: good ones are rare. At elite schools, they are often even famous and individually important in their field. You cannot scale that.

Hello I come from a country where a university education is free and the government will support your living costs while you are a student. In that setting, we have too many people in high school and not enough in vocational school (and the local high school is way more academically ambitious than American high school seems to be).

The way our societies & industries still function, too many highly educated people is not the end goal. There's still a long road to grow the percentage of "information workers", especially roles needing higher education, and frankly all that seems to mean is that you outsource all manufacturing to other countries -- I think we've seen lately that wasn't the greatest idea.