It's difficult to be able to do that especially with the volatility of bitcoin as many people have already mentioned, the only way that this can be done is through payment processors like BitPay where your bitcoin is converted into fiat when it's sent to the university so technically they're not getting paid in bitcoin for their tuition, there's probably a list there of universities that accept bitcoin as the tuition with no need for payment processors just like what Charle-Tim listed. Your question is actually a pretty good idea that a company can create a system for universities so they can accept bitcoin as bitcoin and not as a fiat or maybe even a thesis project for IT students.