Is there a difference between an alternate timeline and a parallel universe?
I mean, if Nero travels to the past and changes history, won't that have an influence over other guys in the new timeline traveling in the past altering that history again? The past of the new timeline is effectively altered too, potentially even billions of years into the past.
FINALLY SOMEONE ELSE GETS IT!!!
I have been saying for a while that, while Nero created the new timeline branching around Kirk's birth, because people from Trek's future are always traveling to, interacting with, and maybe even altering their own past, the changes in the timeline would have HAD to go BACKWARDS as well as forewords!!!!
Otherwise, nuTrek's past would contain many visitors from a future that no longer exists in that time stream - at least not in exactly the same way. And since we *have* time travel and past-present-future all interacting, we even have one (of probably several) mechanisms for why the past of nuTrek would differ in ways from the past of TOS-based Trek!
People think of the timeline branching out from the Kelvin incident like a Y in shape...but really, think of it more like an X...
Otherwise, nuTrek's past would have been visited by people like TOS Kirk and Spock, TNG's crew, Voyager and some DS9's crews. People who may not even *exist* in the new timeline's future. Though, I suspect that in nuTrek's future, people like Picard probably will exist - just because it is Star Trek, and we expect some things to still exist (maybe "the timeline is trying to repair itself" or some technobabble explanation so some things are similar) but they will be different people with different lives in many ways. Like, maybe Starfleet's interaction with the Borg happened differently...earlier, later, or not at all. And maybe something *similar* to the events of "First Contact" happened - but with and alt-Picard or someone else entirely - or maybe in this new reality Zef and Lilly did it all on their own (*again*) no Borg or future visitors needed.
Heck, there would be good reason who some of the time travel stories in TOS, TNG, etc never even happened at all in the new reality!
Like I said, there will be similarities (a Kirk, a Spock, and Enterprise, a Kahn)...but there will be many differences too - even in the past.