Originally Posted by CD93:
“I refuse to believe RTD had the brief to remove The Master from the show for good.
He will be back. In what form. With what agenda. With what body and personality. Who knows.”
Don't have the source to hand (Confidential??) but I have heard that he wanted to pick up The Master story and resolve it as originally intended before old-Who was canned.
I still think the only reason he would come back is because he is a popular villain. There is no reason within the on-going story to bring him back.
As I understand it: the Master is a rogue Timelord like the Doctor; he has no companion so has the Megalomania that we sometimes see in the Doctor; the Timelords inserted some awful drum-and-bass in his head which gave him an extra layer of mental-ness.
I agree that he could return as the leader of the surviving Timelords and perhaps be at odds with the Doctor's philosophy rather than just an out-and-out villain.
I'm sure a new rouge Timelord would be a better bet as that story could be built from scratch to match the modern show.
After all that I wouldn't be surprised if he was brought back simply because he fills a void.