The only problem that i have is that the Pleiscocene animals went extinct for a reason. Climate had a lot to do with that. Also, how would they compete with native animals? In Florida, there are now several non-native parrot-type species that have become well established. Also, would they be carriers of exotic disease that may pass to native plants or animals that lack resistance? Introducing non-native species into local ecosystems, IMHO, is a big mistake.
There was a thread last year on an incident in Africa where two natives were getting their freak on, so to speak, on the outskirts of their village. A lion came out of nowhere and grabbed one of them.
The one on top.
We don't need that here.