While the article was not a model of clarity or great writing, the overall theme -- that Disney is now too expensive for the average family, and that Disney has overestimated the interest of those in higher-income brackets -- jibes perfectly with my own observations.
I was reared, and still reside, in a lower-middle-class community where the average household income is about $65,000 per year, and median household income is only $42,000. WDW trips are something a family around here scrimps and saves for, sometimes for years, but which they also tend to choose again and again. We're 1,200 miles from Orlando, yet WDW is unquestionably the most popular out-of-state destination for local families. They'll go there 10 times without ever thinking of going somewhere else, because once they know they like it, they don't want to take a chance on an unknown quantity, especially when vacation time and dollars are so dear.
On the other hand, I used to work at two renowned, multi-national law firms, where my coworkers and "work friends" were typically making $100K-$1M per year (by themselves, without even adding in a spouse's income). They might take the kids to Disney once or twice while they were small, and stay at the Grand Floridian and spring for private tour guides because they want to opt for "the best" any vacation venue can provide -- but most of them came back complaining about how chintzy and cheesy it all was, and expressing relief that they were done with this particular rite of passage. They didn't make WDW a regular, repeat trip: why would they, when they could and did take regular vacations to exclusive, world-class resorts across the country, in the Caribbean, and overseas? World Showcase can't possibly impress you, when the world is already your playground. If Disney really thinks it's posh enough to compete with the kinds of vacations most high-income folks actually take, it is -- to quote one of those million-dollar-lawyers with whom I used to work -- "drunk on its own beer."
I realize these experiences are anecdotal, but I think they're representative of the larger issue the OP's linked article was addressing. To present an unnecessarily mixed analogy that for whatever reason I feel compelled to make, Disney is out there hunting a few white whales, while ignoring the billions of little tuna who are bumping against the side of the boat, wishing they could more comfortably afford to be caught.