I think this is a misunderstanding of what the goals are, it's not just to go back to some arbitrary time in the past. Often reintroduction of keystone species like wolves lead to increased biodiversity and resilience of the ecosystem, which is useful especially since we are currently going through a mass extinction.
I saw a PBS nature episode on keystone species (maybe you did too?), and how they keep ecosystems in balance. Was one of the most interesting documentaries I ever saw. Am glad to see that in wolf species actually did help rebalance the ecosystem, really amazing to see the theory in practice!
