EXACTLY....Tennant had his run and I know he regrets leaving as he seems to miss the role. But that is what happens whenever someone is there a while. Tom Baker loved the role and still does. But he knew going back to him was a slap in the face to his legacy , Dr. Who fans and the legacy of a show that is about constantly new change. Tennant should stick to guest spots (which this stupid rumor seems to have started where Tennant wanted to do something special for 60th anniversary when it happens) and appear with Smith and others at times.