I'm just thinking about the practical aspects of such an idea. Bankers like their cash flow. Shouldn't people who work more and make more get a better deal? It's only fair!
Bankers like their cash flow, but they also have to compete with other bankers. My claim (and the claim implicit in the article) is that people will get an actuarially fair rate for their education. And given this, they will not pay back more (on average) than if they paid up front, or if they took out a loan under a competitive loan market. I don't think your parody of how bankers think makes sense. Our economic system is not perfect, but it has a certain logic to it, and refusing to engage with that and instead making up nefarious motives, is not productive.