It is fascinating, but before this episode I would have expected the party line to be that only someone with a Time Head would be qualified/trusted to see and then decide the repercussions of either making such a fundamental change 2000 years in someone's past, or concealing it once it has been made. And if even River's line was ... ah. Went back to The Impossible Astronaut looking for River's “We do as the Doctor's friends have always done ... as we're told” and found this instead:

Amy: “We have to tell him.”
River: "We've told him all we can. We can't even tell him we've seen his future self. He's interacted with his own past. He could rip a hole in the universe.”
Amy: “Yeah, but he's done it before.”
Rory: “And in fairness, the universe did blow up.”

Okay, there is some consistency then. And I miss the Ponds...