If something of value is being lost, let them that see that value pay for it.
It is a bit unfair to go to a teenager, set them up with debts in exchange for something that doesn't measurably impact their earnings and turn them loose. The reason they are even in education is because their brain isn't fully formed yet and they have no practical experience. Relying on their judgement of what is a good long-term idea is a bad move.
> If something of value is being lost, let them that see that value pay for it.
Absolutely, but that's not what was proposed above. This quote suggests the usual model in which the government pays for education (which I support, most nations use, and even the US uses for K-12), not the income dependent repayment model proposed by julienchastang.