This topic has been done to death. Personally I don't agree that there is a Prime Universe and that they have basically thrown TOS,TNG,DS9 and VOY out the window.
But I just read on another site the following point about this whole concept.
When Spock does the mindmeld with Kirk he says "129 years from now". Not an alternate reality. Not a parallel universe. Scotty looks at Spock and says "you are from the future". Spock makes the point on the bridge about the past being altered. There is no mention of a parallel universe.
Despite anything that is said by the writers, and fans. There is nothing in the film to make the notion of a parallel universe. They use the concept of time travel and all that has happened is now gone. So again no prime universe.
But I just read on another site the following point about this whole concept.
When Spock does the mindmeld with Kirk he says "129 years from now". Not an alternate reality. Not a parallel universe. Scotty looks at Spock and says "you are from the future". Spock makes the point on the bridge about the past being altered. There is no mention of a parallel universe.
Despite anything that is said by the writers, and fans. There is nothing in the film to make the notion of a parallel universe. They use the concept of time travel and all that has happened is now gone. So again no prime universe.