What can be done about my shiftless nephew?

I was looking forward to seeing my nephew Louis this Thanksgiving, who I had not seen since last Thanksgiving. I have no children or any other nephews or nieces. My brother told me that my nephew would not be showing up, because he is embarrassed because all his cousins are doing better than he is.

Louis is a 23 year old college dropout. He is sharing an apartment and working at a low end job. He is very outgoing and makes a good impression on people. He is certainly not stupid, though he does much better in language related areas than in math and science. He got an 800 on the verbal portion of the SAT.

Louis suffers from no obvious psychological disorders, but he lacks self-discipline and has no ambitions. He refuses to get professional help, though my brother would gladly pay for it. He is obviously not happy about his situation.

The four year college route is probably not suited to him, but he could get an associate degree or learn a trade. He could become a paralegal or a chef or an electrician or any number of things.

Are there other people like this? Is it just a matter of immaturity, or is some kind of intervention required?