I think it's entirely feasible the Packers win it all again. I don't think anyone outside maybe the Seahawks or Buccaneers can stop them in NFC. AFC probably comes down to the Chiefs or Colts, that would probably be a legit 2 way Super Bowl.
Packers are mortal, there's just a lot of dickheads like the Bears that don't pay attention to what it takes to beat them and execute it. even the Vikings have done it.
I don't know much about their contingency plans after Rodgers departs. I still don't find him to be a flashy player, he's really disciplined and grounded though.