Animals that survive adapt to their environment. Our yuppy habitats provide an interesting environment for a lot of different species to thrive in. Mice, rats, squirrels, possum, raccoons, and others have lived alongside us for a long time. Now coyotes, bob cats, mountain lions, feral hogs and even the occasional bear have decided to check out the 'burbs. And why not? Lots of food and its generally safe for them b/c most suburban environments don't allow for an immediate response (ie I can't pop out my rifle and kill a coyote that has entered my backyard).
I don't quite see a downside to this though. Excellent way to dispose of those annoying neighborhood kids who think throwing rocks at people's dogs is entertaining. I think annoying kids being hunted by a pack of coyotes is entertaining.