Why would NE make it to the SB again? The AFC does have a few decent teams, and the Broncos will still be significantly better than the Patriots. NE plays in an incredibly weak division. They don't get tested and aren't ready for the best teams. The middle of their schedule is rough but they close with all division games. They will win their division, and then get bounced, as usual.
SF or SEA will take the Superbowl this year. Hopefully SF. One, because I am a SF homer and two, because repeating as SB champs is very hard to do. But it wouldn't be shocking if SEA pulled it off.