10 years of bad decisions and clock management.
10 years of being angry at fans. (see constantly bringing up the boos in 2005)
10 years of losing to his rival, and if he did happen to win it took a miracle.
10 years of being outclassed by his main rival.
10 years of bad coaching hires. When they didn't work out, he fired them and made an even dumber hire.
10 years of failing to put all the pieces together when he had them at his disposal.
10 years of failing to "prepare his team" or get them to "execute at a hire level".
Yes, we have 10 years of his work to look at. What in it tells you that he will actually get BYU to the next level? We are irrelevant, losing games to teams that BYU had no reason to in the past.
10 years is enough.