I'm starting to hate being that guy who is anti-pagano but to counter some of your points:
1. anyone who wanted to fire Pete Carroll or Dan Quinn after bringing there teams to the Super Bowl, is just plain ridiculous.
2. The Reason we fired Jim Caldwell after he brought us to a Super Bowl and only having one bad season the previous two had 10+ wins was that we wanted someone with better defensive skills, and We have received a couple years of relying on Lucks arm, like how we used to rely on Peyton's and no reliable defense.
3. After let's call it 4 season's (not counting the season he was sick) and numerous changes in position coaches and Coordinators I don't believe in his ability to hire/keep coaches to improve/develop the team.