There are so many inconsistencies with a Paradise Earth. In fact, I don't think it ever existed. Just look at predation/parasitism. It's gone on long before any so called "Garden of Eden".
If you still believe sharks, crocodiles, lions, or any predatory animal will one day eat "hay", you've owe it to yourself to stick your head into the gaping, hungry mouths of these "soon-to-be vegetarians."