God
The whole thing was a reboot all this Prime Universe stuff was so the ardent fans wouldn't go mental
Star Trek 09 is a homage to the original Star Trek. The 09 reboot can be compared to what DC did with it's New 52 comic reboot. Barry Allen Flash, altered time, and at the end attempted to restore the timeline to normal. He succeed but as a result he created a different universe separate from the the two he came from. This allowed his friends to live in the original timeline and live new lives in the New 52 universe. For DC it allows for all the comics from the 1987 reboot that ended in 2011 for to exist along side this new continuity they started. It's done so that all the great things the characters did still count (and fans don't have to dump their entire comic collections) but it also allows the creative teams to borrow ideas from the previous continuity.
For Star Trek it allows the creative team to reference and use alot of themes, ideas and character from the original series in this new reboot.
Nero's reference to Prime Kirk being a great man. As he strangles 09 Kirk
Prime Spock's giving 09 Scoty, Prime Scotty's transwarp beaming equation. That 09 Scotty hasn't perfected yet
09 Sulu's "fencing" training with a katana. Prime Sulu used a rapier >_< jerks.
And other things i can't think of off the top of my head.
Star Trek couldn't be a reboot like the James Bond series. Where the title character is changed every several years or so, but each has similar and unique qualities to them.