There's got to be a point where prices are high enough and job prospects are poor enough that people will finally start questioning the "get a degree" wisdom.
It also mentions that the data is from 0.1% of students. While that's still a fair number, there's room for error.
In addition, "college" doesn't make much sense as a category of discussion, because "college" is so many different things. I've been writing as much for years: http://jakeseliger.com/2012/12/15/college-william-deresiewic... and doing so mostly futilely, it seems.