At least, this article would tend to indicate the worst...
"If we don't change something, we're going to continue to lose this battle," [researcher Linda K. Lord, assistant professor of veterinary preventive medicine at Ohio State University] said. "We're going to have more and more cats reproducing, and we need to think about collective community approaches to prevent that."
Has this scientist never heard of something called a natural predator?
I'm thinkin' we ought to worry a little more about how to keep the coyotes from chowing down on them all, around here.