Okay, this is what really had to happen. The entire story is the dinosaurs being foolish, abusing themselves and the world, and this is what finally comes to them, naturally, brought wholly upon themselves. I'm sorry it had to end this way, but ultimately, it gives everything else a gravitas, and is a certain foreboding warning--even if the Dinosaurs are stupid to the point of hyperbole.
It had to happen. It was only a matter of time.