Luck of the Dinosaurs

http://blogs.discovermagazine.com/80beats/2008/09/11/dinosaurs-ruled-the-world-because-they-got-lucky-say-scientists/

The dinosaurs that held dominion over the Earth in the Jurassic Period didn’t rule the lands because they out-competed every rival, a new study says.... Instead they may have just been lucky enough to survive a drastic climate shift when their rivals
didn’t.

Attributing it to luck seems like a cop out, but I am sure the scientist who published the study have more knowledge on the subject than I do.