The "sharp pencil guys" (as Walt Disney called them) have no control over economic forces. Nor did they anticipate the delayed rollout of MyMagic+, which even Iger had to backpeddle on in front of Wall Street.
Those running WDW are highly attuned to the concept of lean enterprise. It's why, for example, we've seen WDW decrease the number of varieties of french fries, eliminate printed napkins, reduce consumables in hotel rooms, defer maintenance, etc. Improved operational efficiency was one of the big selling points of MyMagic+. Current WDW management lives and breathes for improved efficiency.
Instead of improving efficiency, this is what has happened to the number of unoccupied rooms:
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The number of unoccupied rooms is at an all-time high. The number of empty room nights now exceeds the post-9/11 economy, which had a debilitating effect on WDW's business.
Put another way, WDW now has the equivalent of a completely empty Grand Flordian, Polynesian, Port Orleans French Quarter, and Pop Century every night.
With Per Room Guest Spending (PRGS) at $267 in 2013, over 2.2 million unoccupied room nights represent a tremendous waste of company assets and over
$500M in lost revenue annually.
The idea that those running WDW would intentionally increase room inventory so that the number of unoccupied room nights would increase simply ignores their behavior in all other aspects of WDW operation.