I like the direction of the zoo with the asian highlands and tiger exhibits. Simple but high quality exhibits for species that deserve better homes, yet that do not break the budget like the elephant exhibit. It seems like from the zoos website that the most signifigant components of the PCA collection are the Madagascar animals and gorillas. Besides that their are some cool species, yet no big crowd pleasers. Maybe the zoo could just construct an African primate complex closer to the African section with gorilla, lemur, and mandrill. I'm imagining something like Como has for gorillas, along with a trail system for the primates. That would cover most of the species within the building, obviously bar the aquatics collection.
Why I never see a PCA refurb, is first of all the cost. Infilling the zoo with the asian highlands exhibit and cheetah exhibit is most likely much cheaper than retrofitting the building and constructing new outdoor exhibits. Also it just seems so separated from the zoo, that naturally without a draw, its hard to justify it remaining open. Also in the past the zoo did want to expand the rhino exhibit if I am not mistaken? Is that still in the longterm plans given the success their breeding program has seen.