The veteran safety's contract runs through 2017, but he's not guaranteed to be an Atlanta Falcon in 2016 and 2017.
A couple of weeks ago, I spent the course of an article talking about Robenson Therezie, a safety the Falcons clearly like very much. Therezie hasn't done anything overly impressive since then, but his future value remains high, particularly because we don't know what's going to happen with William Moore.
Willy Mo is a terrific teammate, hard hitter, and playmaking safety, and has been since he was drafted in 2009. He's also played 16 games just twice in his career, and his 2015 campaign has been the very definition of uneven.