The biggest thing here is, if the Pats, being the healthiest they've been since pretty much early November, can't beat a duck throwing Peyton Manning led Broncos, (whom they previously should have beaten sans injuries and a muff punt and against a better QB no less) than whomever they face in the Super Bowl would've destroyed them anyways.
There's no point in being scared of playing Denver in Denver. If this team is the better team as we all assume, they'll get the job done.
If they can't beat the Broncos, they've got no shot against Carolina or Arizona.
Sorry, but Denver in Denver is a million times of an easier game than Arizona or Carolina on a neutral field in Northern California, especially if the weather is bad on Sunday.