Bird Flu...millions of years old?

So this "bird flu" thing has been in the news quite a bit lately. Lots of birds being slaughtered to stop the spread of it. They say a bird gets it and the bird dies. There is no getting better from it. Seems to affects birds quite severely, obviously. Could very well wipe out every bird on the planet if it were to spread through the harvesters. Places we get our KFC from for example. My thought on this is that many scientists have said that birds are the descendants of dinosaurs. My thought continues in saying that perhaps this "bird flu" that is killing so many birds is the same flu that wiped out the dinosaurs millions of years ago. It killed all the larger dinosaurs, leaving only a few smaller ones to survive, perhaps dinos that just happend to never have any contact with another infected dinosaur. If this flu wiped out all the dinosaurs with limited cross atlantic contact, it stands to reason that if this flu were to mutate into a version that is easily transmitted between humans, humans could effectively be wiped off the planet. They say in the news that scientists fear millions could die. I'm looking more at billions. Maybe only a few million left on the planet after all is said and done. Come on get down with the sickeness. Oooo wah ah ah ah....