JJ Abrams is giving us three films. No more, no less. He was in the right place at the right time.
Paramount would've eventually wanted to reboot Star Trek, Abrams or not. CBS will eventually want a new Star Trek series. If not them, then Paramount when it gets its own TV wing (back) up and they'd work something out with CBS in that scenario.
Even in 2005, I never thought ENT would be the last series but I didn't expect one any time soon. When CBS and whoever else might be the right people are good and ready, they'll have a new series.
On the film end, ST XIV may continue in the Abrams style or
whoever produces/directs after him will want to do Star Trek their way.* It would be revamped again at the very least but more likely just rebooted again.
* I know there's a strong chance JJ Abrams won't direct ST XIII but he'll still be producing and they'll probably want to keep the next film consistent with the first two so I don't see any serious changes happening until after