Aw, this was just gorgeous. I too felt like initially the escape from death was a cheat, but actually this post (and Moffat's tweet!) makes me feel so much better about it :D
One thing though:
avert the Falling of Silence, by killing the Doctor so he would never get to Trenzelor,
I think that's backwards: remember it's the Doctor's silence that they are actually trying to ensure. Because the alternative is too horrible to think about. "I never realized it was my silence. My death." The Silence is not trying to avert "Silence falling" they are trying to ensure it. As Dorium says, "Silence must fall when the Question is asked", as in, the Doctor had better already be dead because if he's there, he'll answer and then apparently, Bad Shit Will Happen. :D
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One thing though:
avert the Falling of Silence, by killing the Doctor so he would never get to Trenzelor,
I think that's backwards: remember it's the Doctor's silence that they are actually trying to ensure. Because the alternative is too horrible to think about. "I never realized it was my silence. My death." The Silence is not trying to avert "Silence falling" they are trying to ensure it. As Dorium says, "Silence must fall when the Question is asked", as in, the Doctor had better already be dead because if he's there, he'll answer and then apparently, Bad Shit Will Happen. :D