Corporate Disney is banking on hotel occupancy not dropping significantly with the discontinuation of DME.
Per the following chart, there is some risk to this. Hotel occupancy has remained consistently high ever since DME was introduced in 2005.
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Still, Disney can backtrack and reinstate DME ("Back by popular demand") if DME's elimination turns into a financial mistake.
The concern is that hotel costs are relatively fixed. A hotel with a 70% occupancy rate might loose money, while that same hotel with a 90% occupancy rate might make a great deal of money. (It's why services like Priceline got their start; take advantage of a hotel's willingness to offer rooms at steep discounts to fill a few more, knowing that those rooms are mostly profit. But it has to be done in secret; otherwise everyone is going to demand the lower rate.)
Let's say WDW hotel occupancy drops from 2019's 90% to 2004's 78%. Disney is counting on the revenue lost from the 12% of rooms to be less than the cost of offering MDE to those 90% of rooms.
In addition, at one time
DME allowed Disney to capture all your vacation dollars. You were stuck within the WDW bubble. However, people now are so used to using services like Uber, this is no longer the case. DME is no longer as effective as it once was.