I not holding that against it, given that it's the general conceit you get with pretty much all these stories. But given they have told pretty much the same story a couple of times now, and they've got 10 years worth of continuity to play with, couldn't they at least change something that gives them an alternative alternative story? Rather than just "We did something different early on, and now we're gonna get wiped out." What if Jackson wasn't the one to solve it, but did prove his theory, and outed the stargate program unknowingly? What if Jonas helped them find something that caused them to defeat the Goa'uld earlier, and they never ran in to the Ori? What if they met the Furlings instead of the Asgard, and progressed faster because of it? Or even, what if they accidently changed the timeline for their better, but someone else came by and told them it needed to change back? Do the story from the opposite perspective, with the other guy winning and changing the timeline, and just don't even try to explain it in Atlantis, just one week, all of a sudden everything is ever so slightly different.