College just isn't for everyone, especially in your late teens early twenties. If he can't concentrate or commit to learning, he's probably got his mind on other things that he needs to resolve before he can pursue a degree. Tell him to quit wasting his time and yours and go do something else.

I'm with you though, I've always thought it would be cool to be a professor at university level. All those young hot impressionable babes in class, looking to you for guidance and to teach them how to be women. Plus I'd spend all class just talking about random shit that somehow applied to the lesson at hand. But really I haven't found many college professors who enjoy what they do, probably because students are vacuous idjits who think more about sex, drinking, and spring break than the subject matters of the classes they are in.