A college education is in no way, shape, or form obsolete.
Anyone who thinks he has it all figured out when he's 18 -- and this comes from someone who had it all figured out when he was 18 -- is a fool.
Even if you think you're going to be an entrepreneur who will never apply for a job in his life (and good luck with that), you will still need a resume to impress lenders, investors, partners, etc. And that resume has to show that you didn't stop your formal education after the 12th grade.
I think if I had it to do over again, I would have pursued a liberal arts undergraduate degree, using those years to learn more about history, the arts, literature, language, etc. I'd take a few business courses, for sure, but in my view the "good stuff" doesn't really come until graduate school.
And then, I'd send myself to the absolute best school I could borrow my way into, damn the cost.
I once looked into going to Wharton for an MBA as an adult (the regular program, though, for two years full-time), and I came to learn that, at least at the time, PNC Bank would loan you 100% of the tuition cost, and they qualified you for the loan solely based on the fact that you got into Wharton. Paraphrasing the PNC brochure, "When you leave Wharton, you won't have any problem paying back our loan."
I think there's something to be said for that.
Plus, as has been stated, the networking opportunities that going to college creates can be priceless, especially if you go to a school that is known to generate business leaders. I have a couple friends who went to Top 5 Ivy League schools, and there's no doubt that the "clubby" nature of these institutions is a gift for those who know how to use it.
So, in my opinion, college is an absolute must. If not for the education, then at least for the girls and the beer.