Alternate Universe is different then altered timeline. Anyway, I don't really care. Its weird how the worst X-Men movie has people trying to jam it into canon, when at least one and possibly two of the characters in it (depending on when the Gambit movie is set, if it even comes out) won't match age wise and Deadpool has almost nothing in common with the Origins version. Even if you like the movie, its been so retconned that it seems a bit silly to try to justify its existence by talking about major changes to the timeline.
It's not. If a universe where your parents led completely different lives (from before the time when you were born) can still have a person in it who is recognizably you, then a universe that's exactly the same except your mom didn't get pregnant until a few years later than she should have can as well. In both cases, you're almost certainly being born from a different egg and a different sperm and under different conditions and still (though the magic of fiction) turning out to be the same basic person, therefore both cases are equally logical.
And I'm not trying to force origins into canon. I'd be perfectly happy if it disappeared - it's easily my most disliked superhero movie ever. But that doesn't change the fact that it is canon, regardless of any possible continuity errors. It was on screen. It continues to be referenced by the new movies. It is canon.
I suppose Wolverine's time travel also caused Psylocke to be born 15 plus years earlier too, and gave her completely different powers. The time travel apparently also made Banshee have a daughter some time after he died. Actually, the second thing couldn't have happened, since Banshee died before Wolverine went back in time, so it was something that already happened in the original timeline. Yet, Siryn still exists. In the end, the X-Men movies had (and still have, to an extent) a stupid trend of using a bunch of cool X-Men as background characters, then having to eventually retcon those into something else when they want to use the character "for real".
Bolivar Trask, Hank McCoy, Deadpool, Psylocke, Angel, even Sabertooth were all used as background characters (or barely coherent henchmen in Sabertooths case) and then the X-Men people went "Oops, we shouldn't have done that, now we want to use them and what we did doesn't fit with what we're doing now". All of these weren't the result of Wolverine's time travel. I like the X-Men movies, but there is a lot of stuff you just have to shrug off because of the weird things the franchise does sometimes. Using Wolverine's time travel to explain that is ridiculous, and doesn't even fit with half of the characters anyway, even if you accept that people can have the same kids decades before they time they were supposed to.
I've already mentioned that it's a ridiculous justification for some of the characters. That doesn't mean it's a ridiculous justification for all of them. It's perfectly reasonable to say (within the context of a comic book universe) that a timeline change could result in someone being born later (though obviously not someone who was born before the timeline changed).
And there's absolutely no reason why a discussion of the possible results of the DoFP timeline change should even be expected to solve every continuity error in the franchise, anyway.