Yep. But Star Trek's time travel has never made a huge amount of sense.
In Star Trek, like other Sci Fi, the "time travelers" memories are not changed. They remember the events. As soon as Janeway went back in time, her "future" was changed. However, all the way up to the very end, as the "future" history was changing, she remembers the "future" as it was when she left. You have to look at ALL the stories before and you will see that the time travelers always remember the past as "they" knew it, before they time traveled...
That's only one factor in time travel - there are plenty of other elements that have been a mishmash of silliness, starting with how you time travel in the first place. If the "slingshot method" worked once, why don't people do it all the time? How can Temporal Investigations ever hope to police that? Anyone with a spaceship can time travel! How can you ever reset a timeline at all? Isn't that like trying to unscramble an egg? Why doesn't the Grandfather Paradox ever trip them up? And don't get me started on that Future Guy stuff.
Those might have been "real" time travel, w/n the same universe, rather than travel between universes. Everyone accepts that the Mirror Universe is still out there and that traveling to and from it doesn't obliterate it. Trek XI is the same idea.
Only thing is there is nothing in the movie to indicate that the type of time travel that occurred in Star Trek XI is any different that than the type that happened in TOS, Trek IV, First Contact, Voyager and so on.
With the exception of Uhura's comment, which again I think was directed at Nero and was in response to what Spock had said, every other comment indicated that they had accepted that THEIR lives had been changed. You have to look at the movie as a whole, and as a whole, they portrayed this as a changed within the Prime timeline.
Oh okay, their timeline was one way and then after the movie, it was another way. Who cares about that? We didn't know how their timeline was "supposed" to go in the first place and had no emotional investment in how it was supposed to go, so if it goes some other way, that's fine with me. Just as long as it doesn't bore me, it's "right."
None of that addresses the important issue, which is that
Trek XI is in a different
reality than the other
Trek series and movies, regardless of whether the timeline has changed from what it was supposed to be. That this is a new reality is proven by the fact that Spock didn't reset the timeline and un-blow-up Vulcan (which never happens! they
always restore their
own timeline.)
...in addition to being proven by the obvious fact that this is the writers' intent and the reason they chose to have a zany reality-jumping plotline in the first place. They wanted to reset the playing field so they could have creative freedom while not upsetting the oh-so-easily upset fandom by futzing with the Prime Timeline. There's no way they could have communicated this more definitively than they did, unless the writers had stopped the action, walked in front of the camera, and TOLD the audience what they were doing. Which would have been awesome but a bit of a break in tone.
I think Kurtzman and Orci should do exactly that at this point - re-edit the bridge scene, freeze the action, and superimpose themselves explaining once and for all what Uhura meant. Release it on YouTube and that's that.
Did the writers want to upset the fan base? Of course not. So they throw in their comments after the movie is made, but that does not negate what actually happened in the movie.
Okay let's say in theory that they didn't think things through, as opposed to trying to explain later what they intended all along. As of the next movie, they will continue with the assumption that their characters are in an alternate reality, de-canonizing the previous idea that the characters were ever anyplace else, so this issue will become moot one way or the other.
That said, it seems that the way the Trek mythology is approached in general does not allow for a Multiverse thus we are back to my original point.
Nope. The existence of the Mirror Universe allows for the multiverse theory. If there are two realities, why not two billion? Multiverse theory does not necessarily hold that "actions" create multiple realities - infinite realities might already exist because that's the way the cosmos is, and has nothing to do with anyone's actions. There have been infinite multiple realities since the Big Bang, and we have now seen three of them: Prime U, Mirror U, Abrams U.