Controversial Opinion: I don't get why everyone is against having a large thrill coaster in this park. It wouldn't break immersion if themed properly, Universal has large thrill coasters in both of its other parks, they're also building a park with multiple large thrill coasters in China, and it would also but the park on the map for roller coaster enthusiasts like myself. It's not like there won't be any other non-thrill coasters in the park, either.
No, the coaster doesn't have to be super tall and go over a bunch of park pathways. But there will be one in the park, I guarantee it.