Well, if you look at older guys who are buried on the bench, that seems to be a good place to start when "predicting" these things. Jordan Paskorz and Richard Ash are redshirt juniors who are behind some youngsters, and Josh Furman is in the same boat, although Robinson's departure opens the door there a little bit. There have also been injury-related rumors about Antonio Poole, who will be a redshirt sophomore this year.
For the record, I'm not promoting the idea that any of these guys should depart.
I didn't really expect Wilkins, Ringer, or Jones to be on the 2013 roster, so Robinson's is the only departure so far that has come as a bit of a surprise.