I've been like Wilford Brimley with my preaching about nostalgia, so this hits home to me. Disney's advertising is like a circular argument with its dependence on nostalgia, but when guests (like me) go and experience little of the pleasing aspects of yesteryear, combined with the seeming nickel and diming for almost everything, it makes me not want to return, and we haven't since 2020 and have no plans to anytime soon. IMHO that is the biggest reason for the decline in attendance. I just think there aren't enough people who are young enough to try WDW for the first time (and don't care about the Disney nostalgia push or the negative reviews by people like me) to offset the numbers of people put off by Disney these days and have become immune to the nostalgia push.
I still read my copy of Neal Gabler's Walt Disney biography from time to time for my Disney nostalgia fix, but if I go to central Florida these days, I'd rather sit at the beach or go to Kennedy Space Center than be within 30 miles of WDW.