WIZ197 - Welcome to SCIFIED! It is always quite agreeable to see new faces! With regards to your question: you have raised a most compelling notion - one that also holds the possibility to be quite frightening. Step back for a moment and consider the ever-changing world and its biology. Were the dinosaurs to have maintained their empire over the world rather than taking a ride to dino heaven on the back of a rogue comet, mother nature of today's world would very likely be a much more savage and nightmarish entity. Consider the fact that the dinosaurs were caught off at the peak of an evolutionary arms race - a battle of attrition to develop the best weapons and defenses. The natural world is ever seeking to improve its life-forms' capabilities to survive, thus the dinosaurs would likely have become something totally unrecognizable to us over the intervening 65 million years after being spared God's curve ball. In their place would almost certainly be something dreadful; evolutionary survivors born from millennia of unrelenting carnage. Perfected for the singular purpose of killing and/or avoiding death. I do not think we would like what we would see.
I certainly hope this information helps with your project! Once again, welcome to SCIFIED! :)