[1] http://www.nytimes.com/2014/05/27/upshot/is-college-worth-it...
Working 20 hour weeks (not uncommon) covers $8-10k of that - so the total debt load is around $40-50k after 4 years. This can be paid off on a $40k a year salary given a desire to spend money wisely.
Hell, you can work 16 hours just on the weekend which still leaves your week free. And you can work all summer. I graduated with zero loans.
It depends on the college; mine lists a cost of attendance of $66k/year. Of course, one can argue that one should choose a college based on financial capability; but then, are you also trading quality of education, and does that affect your later chances of a job in your field…
Also, from what I've seen, some people are able to get vastly better loans than others; in my experience, the interest rate can vary by up to 3x, with poorer families getting the higher rates, as they're supposedly riskier to loan to; I've seen this even in the case of a student with a good track record going into a major that would provide him a good salary upon graduation (and at a school that requires paid co-ops, so he'll be getting resume experience and pay soon, hopefully).