Going against the trend here, but I would suggest finishing the degree. Yes, some drop-outs are successful (and we love to focus on those - American Dream and all that nonsense). But stastically speaking you are much much better off with a degree. Being a drop-out will put a damper on his whole life unless he just happens to be one of that tiny percentange of geniuses that we love to read out.

Maybe an internship in the summer can cure the "start-up experience" itch.