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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.
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That's just not true. I'm hardly a regular watcher of Dr Who, but I'm pretty sure that in the old series the Time Lords were all alive and in the new series the Time Lords are all dead and this is sort of important both plot and characterization-wise.
That being said, did they even try to explain why a Dalek or a Cyberman never looked at a Silent and said 'WHAT THE FUCK IS THAT THING!?'