Those are pretty selfish reasons to reset the lives of basically everyone in Starfleet. I don't think there's a Guinan here telling them their current path is "wrong." How would you feel if someone said "You know, this timeline isn't supposed to exist. I'm going to change it. Your life will be erased, but hey, who cares!"
*Disclaimer* This post is mostly done out of a sake of entertaining the notion. I highly doubt we'll even come *remotely* close to having any kind of a plot where the JJ Universe is "reset." It just won't happen. It would feel incredibly cheap anyway. I remember the rumors that the end of Star Trek 09 would have the Enterprise warp through a blackhole and reset the timeline. Then that final scene started to play out and I thought to myself "Oh no... Don't do that..."
Is it
really that black and white, though?
Quoting a fan film for the first time ever, but Spock from NV/P2's "In Harm's Way" comes to mind:
"Because, Jim... Here, now, in your timeline, billions of people are dead."
Let's just look at what has transpired since the split off.
If we follow strictly what the film shows us... Who the Hell knows WHAT Nero did for twenty years after the huge change that is the destruction of the Kelvin. He may have been engaging in the slaughter of *any* ships he came across. Admittedly that is just speculation, but it is also just the beginning of the potential chaos. The simple engagement near Klingon space is big enough. The premature birth of Kirk. The destruction of a Federation starship, with who knows how many casualties. The death of experienced starfleet officers Robau and George Kirk...
Fast forward, we know there's some kind of a situation/battle going on elsewhere when the flotilla heads off to Vulcan. Something so big that it's distracted the bulk of Starfleet.
We know something happened to Praxis far sooner than it should have, either the work of espionage by Marcus, or the pressure that the Klingons must have felt after losing 47, let me repeat that
47 of their ships. Wolf 359 losses felt by one of the three superpowers of the Alpha Quadrant a hundred years before anything like it had been recorded. So far we're only into the tens of thousands dead or wounded.
The loss of the Federation flotilla. Thousands more dead. Who knows how many of these commanders were vital to future events. Now they're gone. Along with thousands of promising cadets.
We've lost Vulcan. Six billion people dead when they shouldn't be. Who knows how this race of geniuses was to contribute to the Federation as a whole in the years to come.
Who knows what kind of absolute chaos and death has been wrought upon the galaxy as a result of these ever stacking and cascading changes. Klingons pushed to the extreme. Black ops organizations in starfleet pushing us into wars with neighboring civilizations... To say nothing of the USS vengeance smashing into San Francisco and taking out 4+ city blocks of people, and the other acts of terror wrought by Khan.(Including the likely deaths of several starfleet captains.)
So it's not entirely as simple as "selfish" motivation. If it can be shown that the galactic stage as a whole has very likely been trashed.
