...and if my son wanted to go to BYU for his undergrad, I would encourage him to get the grades to make it happen.
...but I still think that if you're an active LDS youth, you have plenty of opportunities to interact with others active LDS members your age at the U if you seek it out. (also forgot to mention the University Wards up there are huge)
I think the only thing you really miss out on at the U is the campus life...but maybe that was because I was living in mom's basement when I went to college, right