Re: 7X13 The Name Of The Doctor(Grading/Discussion)(SPOILERS!)
If Clara hadn't intervened this would have been the Fall of the 11th Doctor. The Silence didn't want the Doctor to live to open the door and let the GH undo all of the Doctor's victories and leave the Universe in ruin. It was better to kill him early than to have his previous battles undone.
"Canon is only important to certain people because they have to cling to their knowledge of the minutiae. Open your mind! Be a Star Trek fan and open your mind and say, 'Where does Star Trek want to take me now'." - Leonard Nimoy