higher education and continuous lifelong learning are as essential to the brain as exercise is for the body. neglect either, and overall health, success, and quality of life will diminish.
in my opinion, too many people look at college simply as job training. it is that, but it's also a lot more.
the analogy i like to use is that a football player is never going to do a bench press or a curl during the game. but if he hasn't done weight training, his performance will suffer significantly. education is a very similar concept.