If I'm not mistaken, this is the tie-breaker scenario in the NFC:
If SEA, DAL, and DET finish 12-4, SEA wins the 3-way tie and gets the #1 seed due to better conference record. I do not believe there's a team in the NFC that can beat Seattle at home in the playoffs. Therefore, it's critical for DAL and GB to win next week, giving DAL the #1 overall seed. SEA would be #2 and GB #3 in that situation because the Cowboys beat SEA earlier this year.
The ideal situation was GB getting the top seed but they blew it last week. They're a good offensive team at home, but there's no way they'll beat Seattle on the road. Russell Wilson will be running circles around that porous GB defense and the outcome will be a repeat of the season opener.
If the NFC championship game is played in Dallas, the Cowboys would have a chance there. And in the SB, either NE or DEN would be formidable opponents.
Don, I was one of the people who conceded the SB to SEA early on and you're correct that they hit a minor slump at one point. But their defense is healthy again, and they're playing well and peaking at the right time, and should be favored once again. It's a nightmare scenario, but sadly that's what we have at this point.