I don’t believe we will leave isolated, big, and diverse oasis of specimens to just repopulate vacant areas.
We are well into a huge (and particularly very fast) mass extinction event, sure only a few headline megafauna species get press coverage, but the amount of invertebrates alone that go extinct and in contrast a single or a few species temporary takes its place in turn expediting the imbalance levels & collapsing entire ecosystems is staggering.