Originally Posted by TJJones
I have to agree with the majority of responders here and say that destroying Earth would probably lose the decidedly-Earth-centric target audience of the movie.
That's hilariously true.
Besides Earth has already been destroyed in yet another alternative timeline in the Enterprise prequel series by the Xindi. Even if many of the casual Star Trek fans that went to see this new film wouldn't know about it, it would be an even more unoriginal storyline than the time travel thing, which was narrowly avoided by the creation of the alternative universe thing.