Some universities are already accepting more students than they can afford. When I was a fully funded grad student at Georgia Tech, I earned a $2.4k/mo stipend but had to pay surprise "student fees" to the tune of $1.5k/semester, including the summer term. That's a big deal when rent is $1000+/mo. I've heard many public universities, such as Berkeley, also do the same. I imagine the GT graduate students will unionize within a few years if they haven't already.