A crossover between the Fast & Furious and Jurassic World movies would only work for the former. As the Fast Saga, as it is now known, has moved into steadily more outrageous territory, some have begun to propose the idea of it crossing over with Universal Pictures' other major tentpole franchise, the Jurassic World series. To be sure, the idea of Dominic Toretto and his crew racing their cars away from prehistoric predators now looks much less absurd within the context of the franchise. The problem is, that isn't a reciprocal trait with the Jurassic World movies.
The Fast & Furious movies have gone through a metamorphosis as perhaps no other action movie franchise has since the series began with 2001's The Fast and the Furious, found its footing with 2011's Fast Five, and arrived at F9. The franchise's evolution is akin to a shark movie series going from Jaws to Deep Blue Sea to Sharknado, and at this point, the idea of dinosaurs being brought into the mix wouldn't be the laughable Hail Mary it would've been as recently as Fast & Furious 6. By the same token, the Jurassic World movies haven't embraced a similar degree of silliness.
As the modern continuation of the Jurassic Park series, the Jurassic World movies are sci-fi, but do still try to ground themselves in some relative verisimilitude. The theme of the series is still one of the folly of scientific hubris and man playing God, with Jurassic World: Fallen Kingdom ending with dinosaurs now freed upon the human population. However, just because dinosaurs now roam the world alongside humans, that doesn't mean the tone and context of the Fast & Furious movies fits them.
In F9, the series sends Roman Pearce and Tej into space in essentially a homemade rocket ship, sees Dom use a steel cable to slingshot his car across a massive ravine like Spider-Man on wheels, and has dozens of other instances of the laws of physics being casually violated. With car magnets and devices capable of hacking weapons systems across the world, the technology of the series has also dived right into sci-fi territory. If Charlize Theron's Cipher or the Eteon terrorist group were to unleash cloned dinosaurs, it would simply be the latest quantum leap of absurdity for the Fast & Furious series.
Jurassic World doesn't have that same luxury because the series is still rooted in concepts of genetics, chaos theory, and scientific overreach. Even with man-made hybrid dinosaurs like the Indominus Rex or the Indoraptor, the series is still sticking to its roots of the idealistic showmanship of John Hammond and the greed of corporations picking up where he left off. The idea that Dom and co. are going to be the ones to get Fallen Kingdom's dinosaur outbreak under control with the power of cars and family works in the context of Fast & Furious, but would be disastrous for Jurassic World.
While dinosaurs, aliens, cyborgs, or time-travel are tools the Fast Saga could now easily wield, the dinosaurs of Jurassic World battling Fast & Furious' almost comic-book-style superheroes would only cut the series' legs out from under it. If it's the destiny of Dom and his family to face off with dinosaurs before the end of the Fast & Furious series, life will find a way - but that way doesn't lie with the dinosaurs of Jurassic World.
