I recently posted an article on my blog explaining why I think Disney's 4th park was a mistake:
"Disney opened its fourth theme park in Florida in 1998 to mixed reviews and confusion regarding what the heck Animal Kingdom was supposed to be. Marketing for the newest addition to Walt Disney World insisted that whatever it was, the park was “nahtazu”. What’s that? It’s an attempt to make the phrase “not a zoo” seem like an African word. (Yeah, it hasn’t aged well.) But here’s the thing. When it opened, Animal Kingdom was totally a zoo. It was a beautifully themed zoo with two Disney-caliber rides, but the primary draw was the animal exhibits making Animal Kingdom “azu”, I mean, a zoo.
Few would argue that mistakes were made with the opening of Animal Kingdom. For at least a decade, it was stuck with the dreaded label of a “half day park”. Since the park opened, Disney has slowly addressed those concerns. As it exists today, Animal Kingdom is arguably a full day experience and worthy of being included in Walt Disney World Resort. Even so, I think it was a mistake."
At a high level, I argue the following points
1. WDW didn't really need a 4th park
2. If you were going to build a 4th park, a zoo wasn't the way to go
I also discuss some of the more common "mistakes" like opening the park with only two rides and miscalculating the expense and difficulty of dealing with live animals.
I can't imagine anyone here will feel otherwise.