From my POV there are two things that are driving the attendance drop.
1.) Price - Hands down price is the main factor. People were willing to pay during the pandemic due to lack of options. FL was the first place to open up, and FL had a near monopoly on vacations for a while, and WDW and Universal had a monopoly on world class theme parks. Now with the whole world competing for the vacation dollar price is a factor again. Which leads into…
2.) Increased worldwide competition - While this is anecdotal as I am only one person, but nearly EVERYONE I know this summer did one of two things. They went to Europe or went out west to some National parks. These are people who are not normally adventurous travelers but traditionally did beach and Disney vacations. But since they’ve been doing that the last several years, they all decided to do something different. Once everyone figured out Europe is not that much more than going to Disney if you have to fly to Disney, off to Europe they went. I am mindblowing how many people I know went to Europe this year. People who traditionally are not international travelers and these are families with younger children.
People have been scratching the theme park itch since covid began because it was one of the few options. With the world fully reopened people are scratching other itches.
Everything else is a distraction. Disney’s been blazing hot for as long as I can remember. Inflation is bad but that’s bad everywhere across the board but airlines are not seeing decreased demand for this summer, hence the record high airfares.