By the time Week 15 rolls around, the weekly overreactions that drive NFL conversation don't all feel like overreactions anymore. We have data now -- months' worth of it. And we have significant sample sizes on which to base our opinions of players and teams.
So yeah, you have my permission to write off the Falcons, because a serious team would not lose 9-7 to the Panthers in Week 15 in the middle of a division race, no matter how sad the division race. You have perfectly good reason, if you wish, to worry about the Cowboys' run defense.