Gerald's stats this year, for whatever they're worth, are not materially different from his career averages. His PER is down significantly, and just barely above the disaster that was his '07 - '08 campaign. He's shooting at a shade under 42%, bad enough for a guard/SF but unforgivable when he brings so little else to the table. I can't recall GG ever getting a tough rebound in traffic or making a nifty pass to a teammate.
You've got to start thinking this is his last shot in the League. Dallas gave him every chance to win a rotation spot in the preseason and early in the season, but whatever improvement he seemed to show has dissipated.