@nczoofan, I do not think that large spaces in itself is a valid criterium for successful breeding. I know too many large open range zoos that to this day have not bred elephants while maintaining a breeding herd ... I rather think it is the quality of the space provided to the elephants.
Further, Zoo Antwerpen is restricted in space proper and thus they have gone out of their way to provide an elephant house using the old structures available and encompassing those in a new elephant habitat. It certainly works well for the bull bachelor facility they have. Most bulls leave the property at between 8-11 years old. I believe they only have a space restriction for up to 3-4 individuals (I think in reality it is 3).
Finally, if you do not celebrate history of a place, you are taking away your own. I quite love the atmosphere at the zoo and what it might be lacking in space is more than recouped in quality of animal exhibits. BTW: they have been reducing stocks over the last decade, while ensuring a complete and diverse collection which is certainly not lacking on birds, herps and fish. Their latest project is the Carnivore terraces (leopard, jaguar - former - and tiger).