I think the point that was trying to be made was that a small urban zoo is never going to be as good as a large open range zoo for a large species such as an elephant.
If so, then I can follow this statement mostly. I just came up with my post because @toothlessjaws' did not clarify if it was only about space or husbandry/keeping in general. However, I know at least 2 examples of urban zoos (= zoos laying within a BIG city property) that have at least "good amount of space" for their elephant exhibits: Tierpark Berlin and Omaha's Henry Doorly Zoo. It always depends on each situation and should not be generalized.
Speaking to a person who was in a position to know, Taronga received a constant stream of complaints about their elephants while Dubbo received none. There is a term "social licence" which is perhaps apt in this situation. The "social licence" for elephants in urban zoos appears to be running out, at least in Australia.
I'm sure you are closer to this then I am. However: "Social licence" doesn't impress me and should not impress the responsible persons of Taronga Zoo either. We should look at scientific facts (and experiences in husbandry) rather then some weird "feelings" that probably have their origin from animal rights activists.