Farm Tigers to Save Them?
Mark Perry suggests allowing tiger ranching to save tigers, and offers the alligator example as an analog of how commercial use helped revive an animal' fortunes. This kind of ownership rights has revived a number of fisheries, and hasn't hurt either buffalo or ostriches either.
This video below is pretty funny, and gets at these issues towards the end. "There might be a few polar bears left if people wanted one for breakfast."