Dinosaurs are still with us, in the form of birds. But could the more canonical dinosaurs, like Tyrannosaurus and Triceratops, evolve again, if the climate and temperature switched back to what the conditions were like during the Cretaceous? Probably not.
While it’s a fun thought experiment, we really can’t predict what will evolve in the future. So much about evolution is down to contingency, luck and chance. Natural selection can’t plan ahead; it happens in the moment, to adapt organisms to immediate challenges. As the late and great American paleontologist Stephen Jay Gould mused: what would happen if we rewound the tape of life to some distant time and hit play? When it reached the present day, would the world be the same as it is now? He argued it would be different, perhaps much so.
Nothing is inevitable in evolution and little random quirks would set life off on unpredictable paths, different each time the tape was rewound and replayed.