I loved it. I got a strong Childhood’s End vibe from it. All these years the Doctor has been playing the Overlord, guiding and protecting humanity. But there comes a time when you just have stand back and let them take that one giant leap of evolution on their own. I think the Doctor, like the Overlords, has always felt a little in awe of humanity. Like he knows we are destined for things he can never be. Twelve’s speech reminded me of Four’s in Ark in Space.