What happens when you win the Super Bowl? I will tell you what happens. Players demand more then they are worth and usually expect to make more money. Players need pay raises, and at the end of the day, you cannot keep everyone. Teams cannot afford to pay everyone, and usually key parts of their team leave via free agency, which leads to holes in key positions.
Did you know; Since 2005 the only team to win a game was the New England Patriots? That occured in 2005. Since 2006, no team has won a playoff game after winning the Super Bowl.