While I completely agree that attendance at a four-year university is overhyped as The Key to Success, the idea that "you can always go back to college" is flawed. While people do go back to school all the time, calling a multiyear timeout on making money is extremely difficult once you start acquiring real responsibilities, and working a real job while in school is no cakewalk.

source: I dropped out, worked as an engineer, then went back and graduated at 29.