The NFL is a league of failure. Every year, 31 teams end the season on a disappointing note, whether it is sinking into the cellar in the standings, missing the playoffs by a win, or finally exiting the postseason. Only one team gets to hoist the Lombardi Trophy at the end. All teams work continually on avoiding failure, but most face it. A major part of that is identifying their weaknesses and doing what is needed to correct them.
There are high hopes for the Dallas Cowboys this season, at least in part due to the way they have addressed many issues in the offseason.