I'd rather have the privilege gained from education taxed at the time it is actually received than at the time of studies. It seems like a fairer approach, as we should recognize that not all education leads to the same level of monetary privilege. I.e. compare salaries for nurses, teachers, engineers, doctors, MBAs, etc.

Most people have to take out loans anyway to cover living expenses. I don't think there has to be any further disincentive for those from non-wealthy family backgrounds.