So, I was talking to the wife and came up with the idea that, perhaps, the Silence--though creepy as hell--aren't evil. Are they enemies now? Most definitely. But, all we really know is that they want the Doctor dead because of something in his future. My guess is that they may come from a timeline where the Valeyard is actualized. The question is then whether, foiled plan to kill the Doctor or not, they were able to significantly alter things to where the Doctor doesn't become The Valeyard (which, I think, Timelord Victorious was hurtling toward) or simply delay the inevitability of fate as it were?