Well technically, they're dynasty was finished some years ago, since usually a dynasty is like 3-4 rings within 4-6 years.
For the patriots to make and win the super bowl, they need to carry a strong mentality heading into these playoff games, seriously.
You can say "ooh they need a defense" or "oh they need a big physical receiver" and all that, but that doesn't mean anything if they are always tense and pressured in these playoff games.
when the giants won last year, their defense wasn't very good at all (it was only their pass rush that was good), and their running game was complete crap.
when the saints won in 09, they're defense wasn't very good either. Even the '06 Colts weren't anything to take seriously on defense.
But those teams won because in the playoffs, they had "We can beat you" mentality that Pats don't seem to have much anymore.