With the way the NFC is shaping up this year, it could be an easier path back to the Super Bowl for SEA than they had last year.
I have questions about SF. It wasn't exactly calm seas over there this past off-season and Kap wasn't exactly looking like a world beater in preseason (yes, I know its still preseason but it still helps).
I'm not sure who else will put up a serious challenge in the NFC. The east isn't the powerhouse they once were. Philly is probably the best in that bunch but they're certainly not dominant. The north is interesting with Green Bay, Chicago, and maybe Detroit but, as we just saw, GB has its weaknesses. The south? New Orleans is the biggest threat. They could be a legit contender to take out Seattle.
Seattle's worst enemy could be themselves or injuries. That defense is pretty darn impressive.