I can vouch that there were serious talks of taking at least Epcot down to partial week operations back in 2002 after the 2000 crash and 2001 events. There were many days where attendance was barely at or below daily operating costs. Obviously, that's a different time and attendance level. But, Disney was taking it on the chin back then.
There is also the DVC issue to deal with. If there were a legitimate recession, vacation ownership is often the first to go. And, that could leave Disney in a lurch if you had even a moderate DVC firesale where Disney wants to keep the value of the product (new members/direct add ons) high. They have already stripped out so many benefits from resale they don't have a lot of meat to cut there before you hit bone. Not saying we're there by any means. Rather, it is a highly susceptible area if people suddenly need to cut costs or sell assets for any price to cover other costs.