Exactly. You wouldn't personally catch me dead at WDW between the end of May and September, ever, but the people who planned vacations in advance aren't deciding all of a sudden not to go because it's a little hotter than normal. It's always sweltering in WDW in the summer, it's expected - and I just don't think huge swaths of people are cancelling vacations last minute because of it (particularly domestically where there is record heat across the country).
What's going on is exactly as you state - for years folks like myself on these boards have been warning this was going to happen. They finally priced the experience too high, took too much away, and expect too much bull crap and the audience willing to put up with all that has fizzled. The post-pandemic travel boom staved it off for a bit, but the chickens have come home to roost.
The spectacular failure of Galactic Starcruiser was not an anomaly - it was the canary in the coal mine. And people certainly weren't not booking that almost entirely indoor experience because it's "too hot outside". It's because Disney finally found the tipping point where the experience has just degraded so much and the prices are so high that they have alienated much of their repeat customer base, leaving them with the "one and done" folks who were part of the post-pandemic boon who just aren't returning.
