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It would be impossible to just get rid of every zoo in the world because where would we end up putting the animals who were born and raised in captivity. Those animals would have no idea where to go or how to survive on their own. That would be like putting a group of people with no survival skill on an island with no supplies.
From the benefit of enlarging zoos it would create a more natural habitat, but it would also give the animals more room for daily exercise, which in current habitats they lack a lot of. Some could argue that it would be unwise to keep animals in same pens, since there are the chance of them hurting each other, but in hindsight you would only group herbivores together and keep vicious animals away from each other.
