Education and money are very much alike in one aspect: if everyone has at least the same amount, then that amount becomes the baseline, below which it is worthless.
College degrees being required for plumbing jobs and the like are only the symptom of this problem.
Whereas before education was made mandatory in most countries of the world, the baseline was no education at all, now the United States have college as a baseline. And it's rather difficult to get out of this, because you ask someone in college why they're in college and they'll say, "I must, because I can't afford to not keep up with my peers." So people go to college because people go to college, and it's a recursive clusterfuck.