If Sea World was *only* rides, you might be right. But if they enhance their ride assortment, and kept most of the animals, like the animals at Busch Gardens Tampa -- maintain the Sealife theme, just get rid of the degrading shows and enhance and enlarge the habitats for the animals. Raze the stadiums and use the space for larger tanks and habitats. As
@matt78 mentioned, create enhanced walkthrough exhibits where people would be able to see more natural behavior, not the silly shows with animals jumping through hoops or honking horns to please guests.