But we already did away with the regeneration limit on screen. Well, those of us who watched The Sarah Jane Adventures. (In the RTD-messes-with-the-fans scene where Clyde asks the Doctor a couple of deeply canon relevant questions, to wit, does he have to regenerate into a white man or can he be black or another colour as well (he can), is there a regeneration limit (not anymore), and some other stuff.) Mind you, I'm not sure the Moff did, so...:)