...much. Time will tell.
Personally I'm long-term bullish on BYU (though I have sever confirmation bias in this respect) and I'm short-term bullish on Utah continuing to be good (though it pains me). The big question will be if when Whit goes will it continue or will you see something akin to what's happened with their basketball team.
Here's hoping they hire the footbal equivalents of Giacoletti/Boylen/Krystkowiak and order gets restored to the universe. ;-)