I love how two-dimensional everyone's outlook is on this new universe in concluding that it's the best way to tell new stories.
Please. The only reason we're in an alternate reality/timeline is because the writers wanted to use Kirk and the original crew. Why use Kirk and the original crew? Because they're well established and easier to write for when compared to making brand new characters in a whole new setting. Personally, I think everybody's argument that stories from here on out should be original and/or new is a weak one since we're dealing with characters that aren't new at all.
I'd like to think the Star Trek universe is more than just about Kirk and his crew. Just my opinion.
The reason for going with the Alternate Reality is so that they could tell a GOOD story, and change some things to make it work better for a general audience without destroying the 40+ years of Star Trek history and lore.
Going back to Kirk and Spock was the right thing because event with TNG, DS9, VOY, ENT etc., the starting place of it all was the original crew.
Everything started from there, so a story of how they got together is the best entry point into the mass of continuity, lore and history we all know, love and debate.
It was a way of doing a reboot, without doing a literal reboot; to reinvent the franchise without rejecting it's past.
I met Nicholas Meyer at a CD signing, and he described the film as "Ingenius, but not Genius."
This is something I definately agree with. The filmmakers found a way to balance the old and the new, and not have them conflict with each other, and went back to basics.
Until TNG, Kirk, Spock and McCoy simply WERE Star Trek. The rest simply spun off of, developed from, and elaborated on the original show and movies, building an incredible universe.
The basic problem: The universe got so complex, so detailed, that writers had to reject countless story ideas because of the history their stories would contradict, and the fan backlash that would inevitably result.
A complete Reboot would have been a mess, because all of a sudden, 40+ years of storytelling would be completely irrelevent, and a large portion of the existing fanbase would have rejected the movie.
Creating an origin film that was completely within the Prime Universe would have been interesting, but the nature of the established past would have dictated a far more pedestrian take, and would have had to have countless leaps forward in time to cover enough of the established events of James Kirk alone (Farragut, Kodos the Executioner, Ben Finney, Carol Marcus etc.), and either confused the viewers, or sent them to sleep.
Simply creating a new crew/mision in the TNG timeline would have defeated the purpose, and we would have more of the same failing formula that was insulating Star Trek from the general public, aka Nemesis II.
When the viable alternatives are considered, the movie made what I believe were the right choices, and went back to the beginning with enough of a twist to work for the new audience Star Trek needed to attract to survive.