I think it has a lot to do with whether last year becomes a stigma or a rallying point. I hope that with last year fresh in their minds they won't take the Seahawks lightly.
This one is hard to call because it has less to do with Seattle and more to do with which Bears team shows up. Chicago has looked good against good teams and bad against bad teams, so pretty much any playoff team could beat the Bears given that the Bears have a habbit of giving games away at times.
If Chicago shows up with good, or at least medium Rex....and a reinvigorated D comes to play...it will be very tough for Seattle to pull it off. However, if those things don't happen, we may see Seattle in the NFC championship for the second year in a row.

Here's to a good game Seahawks fans.