Based on
@Joe 's article, I think I get it. Almost what the the blue sky for New Fantasyland was at one time (B&tB France, TLM France, SW Germany, Arrendale, Wonderland, all sort of in a row--but still "Fantasyland"). Leave out TSM, new Toy Story land would have been an ideal example of this for a "Pixar world."
It works great for Dreamworks. Three or four IPs that each support one E-ticket, maybe a companion C-ticket, a gift shop or QSR, but would probably collapse under the weight of being a new land. All based on the particular aesthetic and in-house style of a single studio, like the classic Disney princesses.
I think it works for Nintendo
IF we get at least one more land (ideally two). Hyrule, Metroid planet, game I've never heard of land--doesn't matter, but I think you need one or two more IPs that aren't descendants of the original Donkey Kong game.
As for the rest tho? I'm stymied. Fantastic Beasts locations all feel like variations on London's MoM (which I think we're getting in FFL)--and oh yeah, the franchise is tanking hard. The three classic Universal monsters who can anchor a mini-land are all set in vaguely 17-18th Century Europe. I guess you could add Godzilla's Tokyo or Beetlejuice but the contrast would be so jarring as to defeat the thesis statement of the park. Hanna Barbara might work, but that's another cartoon line, and not sure WB would part with rights. Not sure what else is out there.
I like Fantastic Worlds better than I did when I first heard Islands of Adventure.
I fear Disney has ruined "world" for this context. I hear this, I think it's going to mean a collection of parks. That will all be on Marketing tho.