A couple of points, the article is discussing a liberal-arts education. A general education is self-enriching and many times will lead to employment, but since the degree is general it does not lead to a specialized career (with high wages). Generalist type jobs at times are hard to come by, especially in this economy.
A degree in engineering, medical fields, the sciences, teaching and similar areas almost always leads to high paying employment. I think the article and the Watchtower many times makes statements based on averages without digging a little deeper into the subject matter.
Obviously there are many successful folks who did not go to college. And if a person has a good skill that matches a market need without going to college then they should pursue it. For those without such a gift college is often necessary.
zarco