Pressure is pressure. Did you know that the Giants played their best when their backs were against the wall? New York media constantly blasting them due to their struggles in the season, forcing them to come together in the locker room, with the rest being history. Don't ask me, go read up what Osi said to Skip Bayless. Stephen A Smith, who lives in New York, and has inside knowledge and would say the same thing as well. The Giants played well when their backs were against the wall.
Why do I bring this up? It's because it validates that pressure can have an effect on either your team or the opposition. You don't think in the NBA, after LeBron joined the Heat and said, "we're gonna win, not 1, not 2, not 3..." didn't piss the opposition off? You didn't think they brought their A game to Miami? You didn't think pressure played a role when LeBron came up super small in the Finals?
Back to the Eagles. You come out and say you're the dream team, you're gonna win it all, you got all these free agents coming to your team. Yeah, you're definitely not setting yourself up for big pressure. The Eagles put it on themselves, and didn't respond well. Their team personality can't handle that, and it showed during the season, when teams were looking forward to beating them every Sunday.
You don't think there was pressure on teams to get on Tim Tebow? Here's a white QB, who can't pass the ball, and is somehow embarrassing the league by playing his unconventional way of football that isn't effective at all. You don't think Tom Brady sent a message in the regular season, and again in the post season by decimating them?