Then they would demand so much money from the producers of sequels, that benefit from every next movie would never cover all costs.
What if there was a new pack of sharpteeth outside of the Valley and they had kids, who would befriend Chomper, but not other members of the gang?
Pessimist sees a dark tunnel. Optimist sees a light in the tunnel. Realist sees the light of coming train. And a driver sees three idiots standing on the track.
"My heart has joined the thousand, for my friend stopped running today." - Watership Down by Richard Adams.