The expectation of sustained success is usually placed on team by the feeling of entitlement from the fan-base, and with good reason.
The thing is, 31 other teams (arguably 30, Dallas :P) are trying to win the bowl game, and each team has to try and do it a different way because the playing chips are different for each organisation.
I think it's too early to say the Packers' are slipping - a quick look at the top tier teams in the NFL (Seahawks, 49ers, Patriots, Broncos) and it's evident that there is no need for panic, a massive rebuild or anything of the sort.
Out of those four teams, only the Patriots can stake claim to sustained success over a decade. The other three teams have gone through dark periods, and with upcoming moves on the business side of things, you can bet on atleast one of these teams taking a step backward in the next few years.
Our team isn't built to win the way Seattle or San Fran do, it's built to win like the Broncos do, similar to the way Indy was built when Manning was there. This year was the first where the prospect of playing without your core was exposed, and luckily it wasn't for a full season (Colts 2-14 year). I fully expect Ted, Mike et al to recognize this and try their level best to ensure that we can still compete without our starting quarterback.
I have faith that even though we have had a rocky few years during clutch time, we will improve and we will return to the summit of the elite. Possibly in eight months time.
Zero2Cool is my captain.