I wouldn't be at all surprised if the 49ers, the newly anointed "best team in the NFL", lose to Seattle next week. They'll have a hard time finding the same energy that they found against the Pats, and 1 more win gives them the NFC West, so they pretty much have the division locked up.
I think a Pats/Seahawks SB is as likely as a Broncos/49ers SB at this point. Both are realistic possibilities, nothing more. 4 good teams. And at least 3 more who could have a reasonable shot at making the game (Houston, Green Bay and Atlanta, probably in that order). I think anyone else is a real long shot at this point, though stranger things have happened.