There are the schools he might want to apply to and there are also requirements for different colleges/majors within the school.
DS only took 2 years of foreign language. When making the decision to continue we checked the schools he was interested in. For his top choice, he needed 4 years for the College of Liberal Arts, but only 2 for Science and Engineering.
In short, he has to really know where he wants to end up to know if it will hurt him or not.