A large component of a university education is not so much what you learn at university, but the doors it can open for you later. In general (with some exceptions of course) it is unlikely you would be using very much of your university knowledge after a few years in your job in any case.
You can have a very successful career without a college / university education, it is just easier to do the same with such an education.
It is almost impossible to get certain jobs at all without a university education. For example, try getting into a major investment bank in any kind of well paid position without a good university education or serious work experience - it is just not going to happen.
This is not a comment about trade schools - it should be a completely valid and respected career path, I am just saying that one should try getting a university degree if at all possible and makes sense for your type of career.