Best case scenario, the Rams take down the Lions. Then the Rams go to San Francisco, where they won today. The Niners have to play the Rams for the 3rd time this year, and the Rams are hot. Cowboys get the winner of the Eagles/Buccaneers game instead of the Lions. I don't think anyone thinks the Eagles or Buccaneers can take down the Niners, but the Rams just might do it. That would potentially give the Cowboys a home game for the NFC Championship game - assuming they take care of business in the first two home playoff games.
At that point, the Cowboys would be favored to win the NFCCG, and get to the Super Bowl.