I don't think so. They've had a few games where they actually COULD have lost so I think somebody will beat them, probably 2-3 teams will. the Pats in 2007 either blew out or toyed with every team all season.
The Patriots had a few they could have lost too. They had 4 wins by 3 or 4 points, and the last game of the regular season against the Giants was stolen from the Giants by the officiating crew. If not for that, I don't think there's any way the Giants beat them in the Super Bowl.
As for the Packers, they are pretty damn good. Even when they get down big, Rodgers seems to be able to make it up at will and throw 3 or 4 TDs in a quarter without breaking a sweat. Also, their closest game was 6 points.
Nevermind the fact that if you look back to that Patriots team, they didn't exactly have a brutal schedule for the most part. Their opponents were 120-136. In contrast, the Dolphins went 1-15 that season against a 141-115 schedule. It's all about who you play.