one prevailing theory is that the space aliens having perfected the dinosaurs saw that the experiment was a successful
oucome. but there were no end game, or caps to the open-ended expansion. they visualized a better solution, that is warm-blooded mammals, even though the dinosaurs had been ultra-successful up to that point in time.
they decided to pull the plug, and re-envision the future of the Urth, for the betterment of All. the dinosaurs could further contribute by converting bionics into oil, coal & natural gas to further assist the establishment of the mammals.
now it's beginning to appear that the mammals might be successful after all.
