Answer: I believe it has very little to do with it. In my opinion, the Dez Bryant catch/non catch is the most questionable example that could make an argument. However, I dismiss it as a league conspiracy and simply something I can forever blame Dean Blandino for (INCOMING!)
No. I do not see a macro level causality (e.g. the league). Rather, I identify a micro level reason at the team level only.
Coaches come and go. The same goes for players, scouts, front office personnel, etc. Ditto for Dallas' opponents at all levels of their organizations. All these entities influence what happens each game, whether on-the-field, from the sidelines, or supplemented by sub-management. All are variables that have fluctuated the franchise's ability to compete for championships.
There has been one constant variable within that winning formula. The one thing that has been an integral component year after year after year. It is an inherent flaw that has never been addressed:
The Joneses in the front office.
I shall not shift blame to the other owners, Roger Goodell or the league office while they are an annual, embedded, and glaring glitch in The Matrix. I will keep swallowing the red pill, please and thank you.