2008 SB XLIII Pittsburgh won. This year Pittsburgh 6-6 with games against Cle, GB, Bal, and Mia.
2006 SB XLI Chicago lost. Next year Chicago 7-9.
2005 SB XL Pittsburgh won. Next year Pittsburgh 8-8.
2003 SB XXXLVIII Carolina lost. Next year 7-9
2002 SB XXXLVII Tampa Bay won. Next year 7-9. Year after that 5-11.
2002 SB XXXLVII Oakland lost. Next year 4-12. Year after that 5-11.
2001 SB XXXLVI St Louis lost. Next year 7-9.
I could really go on forever here.
TP. In some of these cases the team was significantly different like when Kurt Warner got hurt. Some of them like Oakland did it with older guys that had clearly peaked unlike guys in their prime. Some of these teams aren't good comparisons even a little bit. Are you seriously comparing the 2006 Bears to the 2007 Pats?
And even though you are right do you think any of these teams should have just been ok with that? Do you think their coaches were out in Sacramento after that in terms of leaving the team?
Fact is that just about every team I listed went into the next season with just about the same team and coaching staff and stunk. Some of those teams kept their continuity and rebounded. Carolina, Pittsburgh, St. Louis all came back the following years after their down year and bounced back with a good year.
Should those teams been okay with a down year? Hell yes. It's common.
One scenario that is fairly common is a team finishes last in their division, gets a cream puff schedule, bounces back and has a huge year. What happens the next year? They now have one of the hardest schedules in the league and they aren't nearly as good. Happens all the time.
How many of those coaches got fired the year after having a bad year after leading their team to the Superbowl? I think the number is zero or close to zero. Why? Because continuity is the best way to lead a team back after a bad year that followed and outstanding year and owners know that.