I think the problem many of us have is that we love the original way Disney used IP-based attractions placed into a themed, over-arching land. I'll use MK as an example...
- Cinderella's Golden Carrousel - Cinderella movie
- Country Bear Jamboree
- Diamond Horseshoe Revue
- Dumbo the Flying Elephant - Dumbo
- Frontierland Shooting Gallery
- The Hall of Presidents
- The Haunted Mansion
- It's a Small World - World's Fair, NY
- Jungle Cruise - The African Queen
- Mad Tea Party - Alice in Wonderland
- Mickey Mouse Revue - Cartoons
- Mike Fink Keel Boats - Davy Crockett Stories
- Mr. Toad's Wild Ride - Wind in the Willows
- Skyway
- Snow White's Adventures - Snow White and the Seven Dwarfs
- Swiss Family Treehouse - Swiss Family Robinson
- Tropical Serenade
- Grand Prix Raceway
- Walt Disney World Railroad
- Admiral Joe Fowler Riverboat
- Peter Pan's Flight - Peter Pan
- 20,000 Leagues Under the Sea: Submarine Voyage - 20,000 Leagues
- Flight to the Moon
- America the Beautiful
So, that's 24 attractions with 12 of them having direct IP tie-ins. Go-carts were everywhere, as were haunted houses, so we'll cross them off the list as well. We'll also cross off the Railroad and Skyway, as there HAS to be a way to transport guests. That leaves 8 out of 24 attractions/experiences with no obvious IPs. That isn't very many, and those have tie-ins to eras in American history and culture.
- MK is a prime example of taking IP-based attractions and building a "land" that creates harmony among and around them. The land itself may have an overall theme, but it's not IP-based. The six lands are: Main Street USA, Tomorrowland, Fantasyland, Frontierland, Liberty Square and Adventureland.
- Epcot has a Future/Space "land" and a world's fair "land".
- AK has Asia, Africa, Dinosaurs and a discovery "land".
- HS was the only one that didn't really divide itself into lands, so the whole park was basically a "land" themed after old Hollywood.
Unfortunately, the parks already cover most of the "loose" themes attractions could fit into unless you start narrowing the "land's" focus - like deserts, tundra, mystery, etc., and then you'd still likely have attractions that seem misplaced or shoehorned in. So, creating generically themed lands today is a very problematic proposition. Thus, we get lands themed after IPs, ie: Harry Potter/Star Wars/Pandora/Marvel.