I have read James Barrie's "Peter Pan" (read it in high school, MOF) and I've seen the 2003 movie version of it, which was very good. The kid playing Peter was frickin' amazing. I wouldn't call it superior to the Disney version, although it handled Wendy a bit better, to my mind (not as sticky and stuffy as in the Disney version, although I blame the voice actress for that; Kathryn Beaumont was great at Alice, but her Wendy lacked warmth.)
Yes, George Lucas, Jim Henson and Stan Lee created memorable works. And yet their empires faded, and all three had to go to Disney to make sure their creations lived on. That's because all three men were great in their own limited niches, but hadn't the diverse creative talents to survive in the long run. Lucas created a unique sci-fi universe. Henson created a very successful unique form of puppetry. Stan Lee created a dynamic new way of telling a story in comics ("the Marvel way!"). But NONE of those things had the resonance that Disney possesses. Walt created the greatest cartoon character of all time - Mickey Mouse. He created the best 2D films in existence. He then went on to conquer television, live-action films, and created a new form of puppetry - Audio Animatronics. He invented the theme park. Walt's unlimited interests, and his courage in pursuing and mastering them, gave his company the strength and diversity to survive. He was the flip side of CEOs like Iger, who hates risk and loves purchasing "brands" to fill in perceived weaknesses in the company's lineup, rather than creating original product - whether homegrown or adaptations - to fill in those niches.
When I go to a Disney park, I want to see DISNEY magic - not Henson or Lucas or Marvel or especially Cameron magic. Screw those second-rate artistes. Let Universal or some other non-Disney park have them. I want a Lion King Land, not an Avatar Land. I want Cherry Tree Lane, not a Star Wars Cantina. I want a Fantasia Theater, not a Muppet Theater. There is no way a Disney park should turn to other studios for new attractions. Not when so much actual Disney product lies languishing, unrepresented, in the Disney vault.