Student has already been told that neither our CFI (with Flight Testing privileges (sp?)) nor any other examiner or pilot in general would let anyone fly with him until he starts displaying a more mature decision making ability. I am fairly sure he will mellow with the experience age brings, maybe if one of his friends has a really bad car crash, that sort of thing.
Student once (not with me) tried to pull left on to finals on a FLWOP so hard it snap rolled through 90deg LEFT before the aerobatically inclined instructor caught it. At about 200'. Instructor came back a nervous bundle, took the rest of the day off. Student had no idea what happened, wanted to know how it happened, which is good, but also wanted to do it again (at altitude, I'll give him credit for that)!
I don't think "never get his licence" is appropriate given his inexperience of life in general, but definitely "not for a while".
Thanks for your comments, any other ideas?
------------------
Confident, cocky, lazy, dead.