Per cap spending increases will only offset a declining bodycount for so long.
The model of WDW that we've known for the past 30 years is fundamentally incompatible with a shrinking customer base. Their focus on "short return visits" playing off of FOMO with special parties and cupcakes gave fewer folks incentive to book those once every few years, once a decade, or once in a lifetime trips. They became far too fixated on catering to a base of regular visitors, because reaching those people with treats and tchotchkes is far cheaper than consistent major, marketable attraction development.
This focus has removed plenty of diversity from their portfolio of potential customers, and left them extremely vulnerable to a situation like is starting to come into focus: A regular cadence of price increases outpacing inflation has brought them past the figurative mendoza line right at the outset of a "regular folk recession."
The product can't really be right-sized, quarterly-focused executives can't stomach the needed fix to their pricing model and perceived product value, and the company's other divisions can't handle the cashflow generated by the parks drying up.
Whatever they do will be in business books - assuming books are still allowed - for generations to come.