I would argue that there is no limit to the mileage a film can get out of velociraptors, but the Jurassic Park franchise is feeling the need to expand.  This doesn't always work.  Even though the raptors were a major part of Jurassic Park 3, the film was hyped on the Spinosaurus, and that didn't turn out to be such a big deal in the end.  Now that Jurassic Park 4 is moving forward with Colin Trevorrow (Safety Not Guaranteed) at the helm, the franchise apparently need a new terrifying dinosaur (because the ones that have razor sharp talons and can open doors are so passé), and paleontologist and "dinosaur advisor" Jack Horner says they've got just the thing for the new movie.

Speaking to USA Today, Horner says "I can't actually tell you who that will be, but you'll want to keep the lights on after you see this movie."  Is the new dinosaur Truckasaurus?  Because you should keep the lights on for Truckasurus so you can see him devour cars.  Fingers crossed for Truckasaurus.