I've said this before in the context of DVC discussions, but I think there is something else going on as well---a reduction in exposure to risk. 9/11 scared the living daylights out of TDO, and with good reason. The falloff of travel demand---particularly by air---hammered WDW hard. They closed entire resorts, and were giving away buy-four-get-three deals just to get people to show up. WDW is deeply exposed to changes in the air travel market. There was an interesting Yee piece many years ago on what happens to WDW under an oil price spike, and it's ugly.
http://miceage.micechat.com/kevinyee/ky091807a.htm
And, if you look back, that moment of 9/11 was the turning point in how TDA viewed hotels vs. timeshare---that's when they went all-in on DVC. They haven't opened a single new hotel room that wasn't already under construction (in some form) before 9/11 happened. But they have been converting hotel rooms to DVC units. This makes sense because it shifts some risk from WDW to DVC owners---the owners get a break on total lodging costs in return for a commitment to occupy (or, at least pay for the operation and upkeep of) that unit for many decades. If the owner decides that travel to Florida on an annual or semi-annual basis is no longer interesting, it is their problem to unload the contract, not Disney's. So if the travel landscape changes, Disney is not left entirely alone holding the bag.
I'd even argue we are starting to see this in action, and that's in part what's going on with WDW tourism. Airfares have gone up (and up significantly) over the past few years as the industry has consolidated and removed capacity. Those capacity reductions have been focused on leisure routes, which Orlando is lousy with. As airfare rises faster than inflation, a family wishing to vacation in Orlando has to cut back somewhere else---and one of the easiest places to cut back is the cost of lodging. The Deluxe resorts are the most exposed to this, because their value proposition is the weakest.