I've seen you repeat this talking point before.
By IP, I take it you mean at one point it was the literary or cultural work of a person or group of persons. Not IP as intellectual property. I'd be hard pressed to say any Tokyo Disney Sea Port is IP based, except for Little Mermaid. With your broader definition, that would include Mysterious Island too.
I think a person can make an extremely reasoned case that there is a distinction between referencing great works of literature that reflected European Society's understanding of world, and adding Star Wars Land based off of a movie from 2015. It isn't unreasonable to point out the difference between a 150 year old work in the public domain, and a movie franchise that is still being actively commercialized.
Mysterious Island utilizes works that are ingrained into the human experience. Wonder why rockets take off from Florida? Thank Jules Verne. His works indicate how an 19th Century European viewed the world. It was a reflection of its time. It's quintessential European literature. It also doesn't overpower or upstage the park it dwells in. It can play a supporting role, and be part of an ensemble. If you're picking culturally significant works and legends from different time periods around the world, Jules Verne is an excellent candidate. Another would be Sinbad, a cultural treasure that isn't the property of anyone. He expresses a synthesis of culture's views on the world, and showed the allure and danger of seafaring. It's part of the human experience.
These works fit beautifully alongside Tower of Terror, based off the legends and stories that add depth and character to a city.
Lost River Delta is a little closer to the IP land you speak of, with its Indiana Jones tie ins, but even this brings remarkable and authentic details to the table. This isn't Indiana Jones Land, it's a Latin American Jungle with Indiana Jones in it. Sub par, but a doable arrangement.
I think you're stretching here. Stretching hard. I know you're excited about Avatar, but ignoring the lack of care that is almost always inherent with IPs is naive. Sea has just launched an IP ride that helps you talk to a fictional clown fish, Disney's Animal Kingdom has just launched a land that does not reflect its core narrative on humanity's relationship with nature, and Epcot recently opened a ride that has nothing to do with celebrating man's cultural achievements.
Their track record is awful, and even Avatar reflected a compromise in the narrative Disney promised to tell.
But besides that, IP is great!