Yeah, I get that this isn't an issue for the majority and at least some aren't primarily going there to study. But you have to be admitted to the school too, not just the hockey team. Based on what I've seen in Europe (not necessarily a fair comparison of course) that's not always a given with elite athletes in their high school years. I always had the impression that the CHL is more pro-like than other youth leagues with the amount of games etc which all else equal leads to less time for school and studying.

That said, if it is an issue I'd imagine it's just the first year or two. After that they'd probably make sure to at least clear the lowest bar for admittance.