I don't think its foolish to expect to make the playoffs next season, but I think claiming a superbowl is reaching a bit (although with some tweaks it seems very possible.)
I saw some amazing changes this season, and I see pleanty of future success to come. If we have a healthy secondary and the OL keeps Rodgers protected, great things can happen.
As far as the division goes, The Vikes are without a doubt the biggest obstacle we have to face. The Bears have some potential if Cutler makes good decisions.
What I am seeing is probably a split with the Vikes, kill the Bears and Detroit. Overall a 12-4 season and probably NFC championship round. Beyond that is questionable.