It would definitely be huge if Rodgers is gay and came out, especially considering his stature in the league. He is easily a top five player.
Not to diminish other athletes' recent coming out events (al la Jason Collins, Robbie Rogers, Orlando Cruz, Tom Daley, etc.), in the realm of mainstream sports (at least in the United States), the NFL is king. Moreover, as alluded above, Rodgers is relevant, in his prime, and probably one of the handful of players that could come out and possible change hearts and minds.
In any event, if he is gay, I would love for him to come out on his own terms. I believe coming out is a very personal experience. Therefore, no one, no matter how famous, so be "force" to come out of the closet. Whether by a disgruntled ex or anyone else.