As I see it, a HUGE problem with limiting substitutions would be the officials keeping track of it. In college there is a fourth official. Now, I haven't coached, or been, to a high school game in 4 years, but when I did coach, we sometimes had trouble getting 2 refs at a game (and I coached in Greenville County). I think it would be very hard to get a third or a fourth official. I have seen very few competent high school officials so it may be asking a lot to have the ones in the center keep track. Just my opinion.
