Moffat talking about leaving as showrunner, not ending the show. That came about as a rumour compiled from Smith's leaving and the running low on regenerations. I always assumed Capaldi would be the thirteenth regeneration, and that they wouldn't have to worry about new ones until his Doctor has saved Gallifrey and been awarded new regenerations by the Time Lords. It's been well established that they have the power to give regenerations, and even taken them away and give them to someone else, which is what the Valeyard tried to do to Six. The Valeyard, incidentally, was an entity born from the Doctor's final regeneration (produced in addition to the final Doctor) for some reason that comprised all his hate and self-loathing, and had no further regenerations of his own. I'm hoping they'll catch up with this end of that old storyline, especially given the Valeyard's similarity to the Dream Lord, whose episode would make excellent foreshadowing. A Dark Doctor would be an even more interesting villain than the Master.
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