The last Packs could be "Piscivore Dinosaur Pack", to expand the spinosarids roster, and Triassic and Jurassic Dinos Pack regarding the Eras, maybe they could add dinosaurs pack like "Small Herbivore Dinosaur Pack", "Armored Dinosaur Pack" etc for every kind of dinosaurs in game, but also based on continent (even Antartica), but insted of 3 maybe It could be of 4 or 5; Even later they should add a "Glacier Campaign" (with Cenozoic Animals) but for free to sell more DLCs on that and with a small aviary for birds (basic roster of 43 animals).
Regarding the Flying and Acquatic creatures, the JW Aviary should be free, to sell again more DLCs on Aviary Animals (the free roster should be of 10/15 creatures, and for the big Reptiles like the Quetzalcoatlus, maybe insted of flying they could clim and walk in the enclosure, like parrots because remember, flying requires energy, and to make fly a big creature, you need even more energy);
The least free expansion Is the Acquatic Park, where we can build enclosures for both Acquatic Lizards and amphibians lizards/amphibians, like Sarcos, Deinosuchus, Koolasuchus etc. (the amphibians should have also a "land requirement" so they can also walk and take breaks after swimming for a long time) the big Animals like the Mosa, Plesio and Megalodon will swim slow like the big fishes in the acquariums, while the smaller like Dakosaurus, Geosaurus and Bananognimus a little fast and the smallests like Ophtalmosaurus, Coelachanthus and Hesperornis (yes, also acquatic birds) will swim very fast with moments of slow movements; the buildings will be placed on land like the normal campaing (basic roster of 43 animals)