I’m not a huge fan of the JW color scheme either. It seems a little too boring or muted for a theme park environment. Since IoA is a bunch of fantasy worlds, it’s got quite the rich color palette. Marvel, Seuss, and Toon Lagoon are very colorful. LC, Kong, and JP use a smaller set of colors, but with a lot more depth.
Long story short, if they keep the jungle vibe, it’ll be fine. But, a barren land filled with blues and whites won’t look good.