Even if that was true, it's not the old days anymore. The college I went to is now at 50,000$+ a year with compulsory room and board. Try paying that off with a part-time job and still competing well with your rich peers.
No matter what, it's an enormous advantage to not have to work while in college. I know I wouldn't have done as well if I was working simultaneously, since I was still stressed out as is.