I'm definitely not being argumentative about this, just posing my thoughts on it and enjoying the Trek discussion with my fellow Trekkies. =)
I'm actually quite skeptical that Star Trek 2009 created an alternate universe. I know, and it seems, that everyone believes that to be the case. But I've never felt that was right. I felt from the start that what the story was actually doing was altering the timeline of the actual Star Trek universe. I think that what they've actually been doing is rewriting the history of TOS. And when I first saw it, I was like, hey, so you're actually going to rewrite TOS? And I resented that approach. That's one of the reasons why I've felt a bit cool toward the first Abram Star Trek.
I don't think there's really any reason to believe, whatever Abram and his writers intended, actually, that Spock and Nero created an alternate universe. What indication is there that they did?
When Nero goes back in time to destroy Vulcan I'm pretty certain that he had no intention to go back in time in an alternate universe and destroy an alternate Vulcan. Of course not. He wanted to destroy the Vulcan of his universe, of Spock's. And I don't think there's any indication that he failed to do that.
I suppose I might be the only person who believes or wants to believe that. But as much as I first resented that they, as I believed, were rewriting TOS, I think I dislike the alternate universe version even more.
Another example. If it's all "just" an alternate, newly spawned universe, then why was it so important to Old Spock to get Young Kirk back in the game to "repair" the timeline as much as possible when it's not the same timeline or universe or dimension or whatever? I guess you could argue that Old Spock felt for some unexplained reason that this newly spawned timeline of an alternate universe -must- follow as closely as possible to the timeline and events of the universe he had come from. But I don't know. It just doesn't sit right with me. But to each his/her own, right.
I've actually warmed up to the Abram's Star Treks "destroying," or really, altering the old. Because, in fact, it's not like our TOS DVD or Blu-ray collections are going to disappear like Marty Mcfly because his parents failed to copulate or because the Abram's team got all Śiva on Star Trek. For me, it's kind of a story of how I learned to stop worrying and love the Abram's Star Trek Destroy(ish) and Reimagine Strategy.
I totally agree with you, Rik, that those terrible consequences would follow. But I suppose if they (the creators) followed that to the logical ends, it would spoil our Star Trek fun as everything just went to hell and to chaos. Not to let them off the hook. Maybe you're right, if that's what you mean, that they should just have avoided these time travel storylines. And again, not to let them off the hook, but to a limited extent they have given us storylines in which the badys get ahold of time travel too, and do bad, bad things with it. You're right, not nearly, nearly as devastatingly bad as we know they would do. But I'm thinking of Nero and of the Borg in Star Trek 8.