The more I think about it, the more I suspect this move was
driven by the current economic conditions, rather than
ignorant of them.
Here's what we know so far about 2009: attendance is flat, but guest spending is down. So, people are still coming, but they are spending less. Disney's challenge is to get more of its guests' money when they are in the parks and staying in the resorts.
Here's what we also know: during "busy" seasons, the restaurants are jam-packed full. And, many of those guests are on the dining plan, which is effectively giving them a discount, leaving walk-up guests shut out. And, presumably, those walk-up guests are less likely to be on the plan, because plan guests know they have credits that are "use 'em or lose 'em."
Disney's bet then, is this: by making the plan less attractive when demand for the resaurants outstrips supply, fewer guests will buy the plan. If the restaurants are still full (and that might be a big if) then Disney wins two ways---(1) the fraction of "menu-price" guests vs. "discount" guests goes up, and (2) the discount offered is less generous. So, Disney gets more money out of the guests already coming to the parks.
So, the question is: will the restaurants still be full? That's a pretty interesting question, because part of the reason some of the "lesser" restaurants were full is because
DDP guests (particularly those that did not plan ahead) had to eat
somewhere, and they've already paid for it.
But, I suspect this won't materially affect attendance---I haven't heard many people say they aren't coming back because of this, just that they aren't getting the plan because of this. And, "I"m not getting the plan again" might be exactly what Disney
wants.