So how about requiring all (US) federal financial aid be given in the form of a fixed-percentage federal salary deduction for the first decade after graduation?

So how about requiring all (US) federal financial aid be given in the form of a fixed-percentage federal salary deduction for the first decade after graduation? The school has to defer the aided portion of tuition, getting paid AFTER making their student valuable to the market. If the student isn't very valuable in that first decade (when the school's contribution is maximum), the school doesn't recover much money. I imagine schools would howl about how they have no possible way of knowing what might make their students more valuable in the future while at the same time becoming noticeably less likely to steer their lower-income students into a Marxist Film major and more toward something in healthcare, accounting, or engineering (if qualified) or maybe a 2-yr tech or trade specialty if engineering is too much of a stretch.