While yes the overall issue exists, when you compare WDW to other entertainment products, the increase is astronomical.
@ParentsOf4 would know more exact numbers, but from what I can tell the cost to visit WDW has roughly doubled in the past 10 years between admission, resort rooms, and food.
Looking at something like concerts, which also had their own dramatic rise but now have had to pull back because folks stopped going, should be a warning for them (concert tickets hit a peak in 2012, but have dropped dramatically, almost to the average a decade ago). Particularly today when Universal is such a viable and increasingly more economical option.
There is a point, somewhere, crazy as it may sound, that WDW will suffer if they continue to increase prices. Not in AP's, but in general. The audience they are going for now are those that are the faux-well off - the ones that have two parents and three $40K+ cars in the drive way, a million dollar home they owe 900K on, basically those that live beyond their means and miss a couple of paychecks and are on their way to bankruptcy.
Because those folks don't generally last - and the WDW vacation will be the first to go - Disney can only go so high up the chain because culturally, truly wealthy people view a theme park vacation as a low-class proposition that they aren't going to pay true luxury vacation prices for, because they know what actual luxury is (and make no mistake, nothing at WDW, not even Grand Flo, etc., is anywhere near actual luxury).