Oh don't get me started...too late!

I actually have two things to say about this, but since they're both quite long, I'll just stick with one now, and the other later.
The first will be focused on a master plan I made for fun a few years back. I realize this now is no longer possible, but why not? Keep in mind this is from about 2015-2016, and the Aviary, Family Farm, Gathering Place entry area, and Macaque Island are untouched:
North America: Remaining in its current spot, this complex would be divided into two parts:
- Northern Animals - Caribou exhibit would remain the same; grizzly bear and American black bear grottos get demolished in favor of forest-edge habitats, up-close viewing windows, and underwater viewing; elk exhibit is renovated to be more suitable for moose and wild turkey; polar bears get relocated to the empty grassy area across from the caribou with up-close windows, underwater viewing, dig pits, grassy areas, and even pop-up bubbles in white mock-rock to simulate seals coming up for air; and the seal exhibit is expanded into the polar bear exhibit, renovated into a more realistic coastal habitat, and also bring in sea lions. The Lakeview restaurant is renovated into a more Northern woods/Alaskan theme.
- Great Plains - Consisting of the former moose, wolf, and brown bear exhibits. The moose habitat would be renovated to house American bison, elk, pronghorn, and sandhill cranes. The wolf habitat would be expanded and modified into a predator-prey set up for either Mexican gray or red wolves. The brown bear exhibit is overhauled for bald eagles. New and improved habitats for prairie dogs and badgers would be situated along the boardwalk.
Jambo! Africa: A massive African complex taking up the Small Mammals building and the forested area behind it and the ARC building. Divided into four parts:
- Forest Edge - A jungle/open forest section featuring an entry point themed around an African forest village, secretary birds, Nile hippo (with underwater viewing), bongo/red river hog, and okapi/marabou stork. Indoor viewing area for hippo, okapi, and African cichlids can be seen here too.
- Grasslands - Consisting of one large savannah habitat for giraffes (with indoor viewing and feeding deck), zebras, ostriches, antelope (such as greater kudu and impala), ground hornbill, and warthogs (which would also have a separate enclosure); and side habitats for lions and cheetahs for predator-prey opportunities.
- Kenya Market - A visitor plaza themed like an African market with shops, play areas, educational features, and a restaurant.
- Kopje - Featuring vultures, spotted hyenas, naked mole rats, invertebrates, indoor/outdoor rotational habitats for dwarf mongoose and meerkats, and caracal.
- Tembo-Kifaru Crossing - African elephants and black rhinos would rotate through four habitats via gates and a bridge (much like Denver's Elephant Passage), with their indoor housing and visitor viewing in the center of the area. Also included is a new habitat for the African spurred tortoises.
Nocturnal Kingdom: A brand-new nocturnal house that replaces the current Special Exhibits building (Special Exhibit areas may get a new home in the Family Farm area). The zoo's current collection of nocturnal animals would move here, and also feature new species like aye-ayes, aardvarks, and echidnas; along with returning species like black-footed cat and kinkajou.
Australia: The outdoor kangaroo/emu habitat remains the same, while the former koala habitats (indoor and out) are renovated for the tree kangaroos. The Great Barrier Reef tanks get relocated to the original tree kangaroo exhibit, and the building gets extended to house a walkthrough aviary for budgies and/or other Aussie birds.
Fragile Asia: An overhaul of the Africa/Asia/South America complex. The big cat exhibits get expanded into the prey exhibits and are modified to house Amur tiger, Amur leopard, bear (either sloth or sun), and dhole. The elephant/hippo half of Pachyderm Mall is demolished, with Bactrian camels taking over the elephant and pig exhibits (with an area for visitors to have up-close encounters), babirusa or Visayan warty pig occupying the hippo exhibit, and either a large bird or deer species in the bongo yard. The rhino/tapir half is overhauled to house either Indian rhino or Malayan tapir. The giraffe yard becomes a walkthrough Asian garden. The previous Asian black bear grotto gets overhauled for either small-clawed otter or fishing cat. The Big Cat Country building is converted to a conservation station. Current red panda and snow leopard habitats remain.
Primate Complex: An improvement of the Primates of the World/Apes of Africa section, divided into three parts:
- Lemur Tropics - a pair of lush islands home to ring-tailed lemurs (alone), black-and-white ruffed lemurs, and red ruffed lemurs, including indoor viewing. To replace the Oceans of Fun arena area.
- Primate Jungle - An overhaul of the Primates of the World building featuring Tamarin Walk, a mini-jungle featuring marmoset exhibits (Goeldi's monkeys, cotton top tamarin, and golden lion tamarin) with minimal barriers; Monkeys of the African Forest, lush indoor and outdoor habitats for mandrills, colobus monkeys, and de Brazza's monkey; and Asia, a mixed-species habitat for orangutan and siamang, also featuring a deck to allow visitors to get at eye-level with apes in the middle of the trees.
- Apes of Africa - the interior remains the same, while the outdoor exhibits get replaced by naturalistic forest habitats.
Komodo Dragon Habitat: A small extension of the ARC building, consisting of an indoor/outdoor facility for Komodo dragons, and replacing the African fish tanks.
Belize Research Expedition: Located where Woodland Retreat eating area is, this section would center on one of Milwaukee's most significant conservation programs. New exhibits for spider monkeys, jaguars, Baird's tapirs, and tayras would be found here; along with giant anteaters, a butterfly walkthrough, and possible various reptiles and amphibians. Woodland Retreat would be re-themed into a Mayan temple eatery.
Milwaukee Zoological Museum: Occupying the giraffe barn, this would serve as a celebration of Milwaukee County Zoo's cherished history. Some highlights could be a gallery dedicated to Samson the gorilla, an Animal Wall of Fame, various historical features and notes, old documents and plans, models of exhibits, etc.
Second Entrance: Consists of the current West Entry plans.