I wouldn't necessarily agree that the end is in sight. Disney just needs to reinvent themselves a little to appeal to new generations. They have become way too complacent.
I think they fell in love with their own financial wizardry and the (illusory) ability to train customers, i.e. "revenue units" to come, heel, sit up, bark, and roll over.
Instead of say, falling in love with their own products, and cultivating the itching, burning desire to constantly make the products better.
It's interesting how innovations have occurred right in Orlando, with the new technologies in Forbidden Journey, the interesting projection techniques in the Hogwarts queue and the talking paintings, the Hogwarts Express storytelling technology ... and other new technologies occur right inside the Disney company with the trackless systems for Ratatouille and Tokyo's Winnie the Pooh. Not to mention the jaw-dropping attention to detail in the atmosphere and decor of Diagon Alley, with the innovations continuing all the way down to the drinks like soda, tea and beer on menu at Harry Potter and Simpsons lands.
Yet ... do we see really big innovations at WDW? Nothing for years. Avatar arguably, in the floating islands and the glowing plants. But it's still just a boat ride and Soarin' over Pandora 3D.
We do see REALLY big, jaw-dropping innovations made in ride rationing, revenue tracking, crowd management and "special pricing".
Which shows what they think of the parks, and of themselves and their customers.