First, finish his college degree. Then stick with baseball ... less chance of a career-ending injury.
I am sure he is hanging on our every word for advice. :>)
what no one else can weigh for him is his level of desire to play either sport in a grind of daily practice, honing his skills for years to come. Also, it is very difficult to project who will develop into a MLB caliber hitter. So many fine prospects wash out before the majors.