You want renewed interest in the Pro Bowl?
A new policy: Players are not designated as Pro Bowlers unless they participated in the game.
Being selected to the Pro Bowl is a valuable achievement when negotiating a contract and when being considered for the Hall of Fame. Play the game after the Super Bowl and if they don't play then they are stripped of the award.
Also, whichever conference wins, those teams get the 9 homes games the following season and the losing conference's teams must play 9 away games.
Otherwise, if they are going to play flag football then the only way to stimulate interest is to require each player to wear a tutu instead of a flag. In order for the play to end, the player with the ball must have his tutu pulled down to his ankles.