You'd be surprised! Many AZA zoos are in close proximity and still manage to attract a great number of visitors. Look at Dallas Zoo, Dallas World Aquarium, and Fort Worth Zoo - all great facilities within the same metropolitan area. Plus, many cities own or at least contribute to AZA zoos in their cities due to the economic benefits and attraction of tourists. San Antonio Zoo
reportedly generates over $800 million annually in economic activity for the area. The cost of starting a zoo would probably be in the $5-$20 million range depending on the size and magnitude, which is comparably cheap.
As for changing the status of the zoo we have now - we've tried for years and nothing has really happened. In 2018/2019, 17 zookeepers
revolted against the Board, mainly to ask the President, Patti Clark, to step down. She did step down from that role, but continues to be CEO and filled the Board with her personal friends with no animal experience, so she effectively runs the Board too. From what I've gathered about Patti Clark, she would rather the Zoo fall apart than for her to lose control over it. Of course we would love to change to zoo for the better, but it's been made obvious to us that Patti will never step down and the zoo will never progress.
The animal care is incredibly poor at the Zoo. I wouldn't say there is outright animal abuse currently occurring, but animal neglect certainly is. I actually got written up for taking a picture of a medical issue with one of my animals to send to the vet. We aren't allowed to have phones so that we can't take pictures of animal neglect (go figure). The keepers of course try to do everything they can, but the Zoo is reluctant to provide the needed resources. At some points we were actively discouraged from going beyond our duties to help the animals. At one point, I was given a verbal warning about staying past my formal work hours (off the clock) to assist in making diets.
And Patti has made it clear she has no ambitions to become AZA-accredited. Even if the Zoo were to fundamentally change their animal care, they will never become AZA-accredited due to lack of disability accommodations and lack of conservation funding/initiatives that AZA requires. The Zoo refuses to participate in endangered species conservation programs, despite having many of those endangered species at the Zoo.
Sorry this is so long-winded - I've just been trying to change the Zoo for so long and I really feel I've exhausted all of my options. In my experience, and many others like me, the ONLY way to prioritise animal welfare at zoos in Austin is for the City to help commission one. Even just providing public land in a central, accessible area would help tremendously to attract investors for an AZA zoo.