:
A paradox was created and the universe sort of collapsed on itself, resolving to a version of history without the Angels in that particular place and time, and rendering it inaccessible to the TARDIS.
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This is my other issue with Dr. Who. They can stick their dick in the canon all the way want using this kind of convoluted, cosmic bullshit. The show is never at risk of actually developing, so they can keep making it until doomsday and it will still be exactly the same as it was thirty years prior.
"This is the very last Dalek in the universe... Oh wait. Wormhole. Now there's a million Daleks"
*five more seasons*