NE would have still won playing in Indianapolis. It wasn't the weather or the fans that beat the Colts. It was the Patriots superior defense. Manning looked like a piker against the Pats secondary, who was without it's best player. Ty Law.
The game might have been a bit closer in Indy but the Pats have done it for several years now, and it's no accident. Only Pittsburgh and Philly have a shot at beating them. Pitttsburgh because they can run the ball down your throat and stuff your offence, and Philly because they can score with anyone and have the best secondary in the league.
Philly will have a better chance if they play the Patriots in the supe, since they're very tough to throw on. With Pittsburgh they have to be able to stop Bettis and Staley and that's very hard to do for an entire game. Then again, Philly should be able to hold onto the ball with Westbrook and get out to a lead against Pittsburgh. The Steelers can't stick with the run if they fall behind, and Rothlesberger can't get them back into it if they do.