If you want to found a web service startup, just do it now. There really isn't any reason to wait until after college.
University won't make any difference in that specific goal and will probably slow it down because you'll have lots of classwork to do. In any event, the point of college is really to explore as much of yourself as you can and learn about ideas you would never have on your own. It's entirely likely that 4 years from now Web services will be passe and we'll have moved on to something else. Either that, or in college you'll find something you think is even cooler.
Then they should open the search to more places than just one campus. Capable co-founders do not just exist in universities, many did not even attend university, or at least left there recently.
University won't make any difference in that specific goal and will probably slow it down because you'll have lots of classwork to do. In any event, the point of college is really to explore as much of yourself as you can and learn about ideas you would never have on your own. It's entirely likely that 4 years from now Web services will be passe and we'll have moved on to something else. Either that, or in college you'll find something you think is even cooler.