Sitting here near Chicago, I know they have given real hope to Bears fans that they can play with and possibly beat the elite offensive teams in the league. Like Dallas, they too have playmakers on all 3 levels of the D. The Bears have a better offense though they don't have a player like Zeke Elliott. I think last night proved it's possible to shutdown these offensive juggernauts if you are willing to play physical and face the consequences of it. Dallas got called with a lot of defensive penalties and the officials missed a few big ones as well. But that might be a better alternative than playing soft coverages and just being destroyed.
That said, the offensive gurus like Payton, McVay, and Reid will make adjustments. I also don't know if what Dallas did last night could be done to KC or LA. The Saints are more run-heavy and have only 1 big time receiver in Michael Thomas. Dallas was able to match up well with them with Byron Jones on Thomas and their two young stud linebackers able to both shutdown the run and dominate in the middle of the pass defense.
For as fun as that KC/LA game was, I still like to watch good defense. As a Cowboys fan, I know they are not a real Super Bowl contender but they are dangerous with a two things that play anywhere: defense and a running game. And that pick to Oakland isn't going to be a Top 10 like many people laughed it would be.