Absolutely agreed.
That said, there's only so long a monolithic presence in a given market can maintain that giant lead whilst continually degrading their product and shooting themselves in the foot.
Witness Microsoft and Apple. About a dozen years ago the thought that Apple would ever be eating Microsoft's lunch would have been comical. Yet, that very thing has come to pass via excellence, vigor, and imagination on one side, and complacency and lack of successful innovation on the other.
What Disney needs to realize is that nostaliga is driving an enormous part of their theme park business: I fondly recall my parents taking me when I was a child so I, in turn, take my own and relive the experience. But the true magic of those times in my childhood is that Disney World was a genuinely unique place with the absolute cutting edge in theme park experiences. The moment a competitor begins to encroach on that, and Universal certainly is with Harry Potter at the moment, and the generational memory begins to turn.
Disney's been transitioning from "awesome" to "nice" over the past 15-20 years. They need to go back to being "awesome" lest they lose the multi-generational angle of their business.