So with this logic, we'll NEVER win another SB again. Ever? Are we cursed?
Lions have never won one. And they've been in the league for 93 years, so they were a long time NFL team for decades before the SB even came about. Cincinatti's never won one. Neither have the Bills, Vikings or Bengals.
Nowhere is it written that every team will win a SB at some point.
Dallas may just have had its run of SB wins. Cursed? No, it takes a particular set of circumstances to win a SB. Did the Patriots have the greatest draft steal of all time when they drafted Brady? No, it was mostly pure luck, if they thought Brady was a potential 6-time SB winner, they wouldn't' t have waited so long to draft him, some other team might have in 5 rounds of drafting.
There's been only one undefeated SB winner, and it took a ridiculously easy schedule and some incredible lucky bounces of the ball to do it. Probably never happen again, doesn't mean they were the greatest NFL team of all time, just that it worked out for once.
If Dallas never wins another SB, it may just be the way the cookie crumbles. We blame Jerry, but he won't live forever, after he's gone, we still may never win another one.