You asked if they can, yes they can. Will they? Different question.
But right now, I could probably name seven teams (out of 16) from the NFC that could make it to the Superbowl, in no particular order: Dallas, Philadelphia, Washington, Tampa Bay, Carolina, Atlanta, Seattle. Dallas has as good a shot as any of those teams IMHO.
As for the AFC, it's probably going to be the Colts. They've finally fixed their defense, the missing link for the past four seasons. They're probably going to win the whole thing.