is there enough genetic diversity for the species to continue to exist should their habitat be saved?

This then becomes a wider question: how much diversity is needed for a healthy species, or from the other side of the question, at what level does lack of diversity become harmful?

If evolution were true wouldn't there be information added to a genome all the time increasing it's genetic diversity?

So long as there is at least one breeding pair, mutations (beneficial) and natural selection, regardless if the habitat is natural or artificial, the genetic diversity should increase. If not when did this process stop for this species of leopard? The same should be true for all endangered species. So the real issue should be weather we can provide endangered species a viable habitat safe from artificial selection (hunted into extinction).