Jerry's ego gets in his way. We all know this.
He does love this team and he does want another SB but while he is in charge and owns the team.
He would easily give up a huge chunk of change for another Superbowl win,
Now about the other teams trying to bring down the cowboys. Maybe they do, maybe they are jealous of the Cowboys franchise always being the highest ranking in Forbes pretty much every year even during down years.
However the NFL would LOVE for Dallas to make it to a Super Bowl, whether the Cowboys won it or not,
Each playoff game would be a ratings bonanza with a bunch of cowboys fans watching, the opposing team following their team and a HUGE number of fans of other teams that hate cowboys and want to see them lose.
It is no shock to read articles about how much a Dallas game gets in the ratings whether that be a night game, the game of the week or a playoff game. Now imagine those ratings increasing for a Superbowl.