Without "free" college, there is already an oversaturated market of college grads that is diluting the pool.
You are thinking of college as job training. I expect that Sanders is thinking of it as preparation for adult life.
Sanders wants to tax the rich at a laughable 90% which would absolutely crush innovation and production.
It would spur innovation. People would be looking for innovative ways of getting around that tax.
Fundamentalism - the anti-American, anti-Christian branch of American Christianity