I think there is a more simplistic answer to this question.
1. Obama said everyone should go to college. (demand increases)
2. Supply is scarce (we don't have enough good teachers, so people are battling to go to the best university however way - money - possible)
3. If demand increases, and supplies decrease, it means price elasticity expands (prices go up)
4. Right now we are trying to increase supply but are struggling (MOOC's will save us!)
So let's all go back to the beginning now and ask ourselves "Why does everyone need to go to college?" I think that's the real question to be answered here.