Regardless if the Eagles lose to the Giants next weekend, the Cowboys can't get the #1 playoffs seed since the 49ers won today and definitely are not going to lose next weekend against the Cardinals. This means the 49ers would get the #1 playoff seed while the Cowboys get the #2 seed. The Cowboys don't want to get the #2 seed, because that means we would have to play against Aaron Rodgers and the Packers (#7 seed).
It would be best if the Cowboys stay at the #5 wildcard spot. This way the #7 seed Packers would play whomever is the #2 playoff seed (whether the Eagles or the 49ers). Let Aaron Rodgers and the Packers play and beat that #2 seed while the Cowboys play the #4 seed easier Buccaneers. Once the Packers beat the #2 seed, they will have to play whomever ends up as the #1 playoff seed. Meanwhile, the Cowboys would play the easier #3 Vikings or #6 Giants (whomever wins their wildcard match) in the second round Divisional Round.
If the Packers beat the #1 seed in the 2nd round (divisional) AND the Cowboys beat either the #3 seed Vikings or #6 seed Giants (whichever wins the wildcard match), the Cowboys would host the Packers for the NFC Championship Game (round 3).
That's the easier and best route to the Super Bowl.