Divisions where everyone is .500 or better are a rarity. Having three playoff teams come out of said division as well... I don't know if that confluence of greatness has happened in the Superbowl era (if someone with better Google-fu than I has the answer, I'd be glad to read it in the comments). But it is possible for the NFC West, and being the team that won a division with that kind of distinction? It would be priceless.
Here's what we need to happen:
CAROLINA OR NEW ORLEANS LOSES OUT
This is the most important factor in both SF and AZ getting Wild Card spots. Unfortunately, it involves the Panthers losing to the Falcons on the road and the Jets at home or the Saints losing to Tampa Bay at home (I could see them losing in St. Louis). This is the most improbable aspect of this whole scenario. The Falcons are godawful and the Jets are so up and down they should have a rollercoaster named after them. Don't even get me started on the Bucs. Still, any given Sunday.
THE CARDINALS AND RAMS HAVE TO WIN ALL THEIR GAMES NOT AGAINST US
Arizona and St. Louis go head to head this week, but the Cards could lose to both them and us and still make the 6 Seed. We could have a division of teams all above .500 if the Rams beat us Week 17, but it will be the first Seahawks game my fiancee will have been to, so screw that noise.
THE 49ERS MUST WIN TWO MORE (AGAIN NOT AGAINST US [OR THE CARDINALS])
The Niners have winnable games against Tampa Bay and Atlanta that could secure them the 5th Seed in the instance of a Panthers/Saints collapse.
THE NORTH AND EAST MUST CONTINUE TO BE BOTTLENECKS WITH ONE CLEAR WINNER
This is the most complicated part. The Cowboys, Eagles, Lions, Packers and Bears are all still well in the mix, though a second playoff team coming out of the NFC Least is laughable at best. However as long as the Lions keep winning, the Cowboys and Eagles have one team win and one team lose, and the Bears and Packers go 2-2 each, we could see a division with three playoff teams and none of the four under .500. And us winning such a division? As I said, priceless.