Thing is Volsung, the way Glukkons operate their businesses, is to spread factories EVERYWHERE. They don't farm animals, they just rope them in. So the idea of Glukkons actually allowing the animals to repopulate is far fetched.
Oddworld is so huge that it doesn't suffer from the affects of pollution, and won't do until Glukkons start logging the countless thousands of hectares of rainforest on oddworld. So any pollution you get from oddworld is found only within the vicinity of factories.
Now, shutting down a factory to move operations to places with more resources would mean putting out the boilers, and once you do that you can't relight them, it just becomes uneconomical. So to move operations elsewhere, would require for the boilers to be kept fired - this would continue to pollute the area, thus killing off all harvestable wildlife.
To tackle this problem, Glukkons harvest everything in sight as quickly as possible. Oddworldians seem to loose interest in novelty meat products quite quickly anyway, so having a species become extinct and having to move on to another species in the end just keeps the customers happy. The customers get to see a change of scene in what they eat.
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