Personally, I think Kung Fu Panda is a big enough IP to have its own standalone land. Trolls/Shrek, I'm not so sure. Can see a mish mash DreamWorks takeover of Kidzone, maybe for 2024, with a new attraction such as a Mack inverted powered coaster that could be built within the necessary timeframe. Then, later down the line after EU opens I do think Toon Lagoon does lend itself to a Kung Fu Panda land retheme.
I do think that other than a potential jurassic world upgrade to river adventure, this decade at IOA will consist largely of re-dos of Toon Lagoon & Lost Continent. In which order I'm not sure, but Kung Fu Panda and Zelda are the obvious choices to me if Lord of the Rings is going to EU and Pokemon goes to USF.