It's often said as something of a mantra: JJ Abrams saved the franchise.
I wouldn't say it quite like that, as many people were involved in writing, producing, and marketing these new movies.
But Trek was down for the count after the failures of Enterprise and Nemesis (I'd even say that Voyager is in part responsible for that state of affairs), so some new life was needed for the aging franchise.
Now, surely Abrams' style helped sell Trek to the masses, but I wouldn't make him the sole benefactor of the revival.
And we still don't know how long this will last.