Agreed, I feel like their current model is:This has always been my ideal layout for Universal. Obviously, the current roster doesn't allow for this.
USF is real places and the stories within; New York, San Fransisco, Los Angeles, London & Tokyo.
IOA is fantasy places but (based on reality) and the stories within; MSHI, Skull Island, Jurassic Park, Hogsmeade & Lost Continent.
Fantastic Worlds is complete fantasy.
USF: Cities (mingling of different properties connected to a midway)
IOA: Islands (immersive islands able to be explored, tied to a single property, branching paths)
FW: Worlds (fully immersive and explorable worlds, devoted to overarching property as well as smaller properties within the overarching property)