I respectfully disagree. When the salary cap came into effect in 1994, it was supposed to level the playing field and be a dynasty killer, but instead it produced the Pats dynasty. BTW, Brady played his entire career in a BAD division - Bills, Jets, & Dolphins while the NFC East has only been bad for the past 4-ish years.
The salary cap had one unexpected effect: It allowed fans to see which franchises were dysfunctional, some more than others and because of this we have seen a lot of bad teams since 1994. Even worse, it seems the number of bad teams continues to rise esp the past five years as we also see a smaller number of great teams.
I watched the 85 bears and there has not been anything close to them ever since due to the salary cap impact and the evolving rules that further hamstring NFL defenses. Romo faced plenty of bad teams.