I've had this idea for awhile. Since I knew that the Dinobots were going to be in it. I think the intro of the movie will explain how the Dinosaurs went extinct. A possible war or something to do with killing off all living things to harvest whatever. Or* The Dinobots killed them all. Then went into a deep slumber/hibernation/stasis. Probably a lot less complicated since it is a Bay film, but we'll see next month.