I remember watching a video in which, a paleontologist said it would be possible in the next couple of decade, BUT it would be illegal/immoral/expensive. Basically, while it would be possible to 'bring back' extinct species, it would not be allowed. I don't know how valid the video was, but in my opinion it seemed legitimate enough (reported by a news company I had never heard of although I have heard a little since then, I would love to provide you with a link, but I can't remember the name of the video.)
