This bit reminds me of the entire plot to Stargate: Continuum. Particularily, the conversation with Landry in their alternate present…. mind you, their altered timeline at this point was pretty good as far as things go as far as Unsuspecting SGC-less Alternate Earth was concerned, though it turned ugly only a few…

Okay, hopefully this makes sense… this might not be correct. I'm not sure, I've been retyping this like ten times trying to put it into words…