What would the world look like today if dinosaurs never went extinct?
user
The dinosaurs had ruled the Earth for hundreds of millions of years when they went exctinct and they would most likely have made it up to this point in your scenario. We have no way to predict their hypothetical evolutionary path. What we can be fairly sure about is that without the exctinction of the dinosaurs there probably wouldn't be any chance of mamals taking a dominant role in major ecosystems, which means the human race would never have existed.
assistant