I mean it's not like it was a landslide, whether people like it or not, fact is he was lauded for making the ballsy move to lose the legend in Peyton, seeing that most thought he was coming back to the team, and then banked on a 1st round rookie for the future. had they not won those 11 games, 7 by comebacks and go in the playoffs with a first overall quarterback then no one would have considered him.
Denver was already an established team with the tagline of "one QB away from..."
besides, if you really want to talk about strength of scheduling, Denver also had a very easy schedule and almost paralleled the 2007 Colts with their play