The last thing Disney World needs is the loss of yet another "classic Disney" caliber ride (ones with richly themed sets and plenty of animatronics, not needing to rely exclusively on video screens or thrills along with minimal physical elements and actual immersion). EPCOT's Future World razing was bad enough. These are quality rides that we'll never get back once they're gone, and unfortunately (given a lack of either ambition, budget or talent) quite possibly the kinds of rides we'll never see built again.
Even in DHS there's plenty of room to expand the park past its current boundaries, and plenty of other actual wasted space within the current park to use as well.