My prospective is that you are trying to evalute the college as a place where you will live and learn. Baseball coaches and athletic departments do a pretty good job of selling; it should not be too difficult to get some prospective as to what the baseball program is all about.
My recomendation is to focus on what it means to be a student at that college. Make arrangements for your son to go to a class or two. Visit with a professor in an area that he may have an iterest in. Eat in the dining hall, spend a night in the dorms, hang out with kids that go to school.
I have yet to find a kid that plays ball that can not adapt to a new team, coach or program. However, finding a place where they will be happy, engaged and healthy is what you should be looking for when you visit a college.