Someone posted an interesting link here last week to a blog report from an anonymous employee for one of the NFL teams. This guy claimed that the legal departments for teams across the NFL had been looking for ways to compel the players to stand, but all the owners have been warned that they have very little leverage here.
Bribing them is probably not a bad approach at this point. You can be 100% certain that this will be addressed in the next collective bargaining agreement between the owners and the players union.