This is a traditional slow time of year. Still, this May has been slower than what we saw in the 2016-2019 time period.
The summer hotel discounts, annual pass bonus days, and specially priced tickets suggest summer bookings are not meeting expectations.
As some have suggested, I think it's (mostly) the end of post COVID "revenge vacations". Those who deferred their Orlando vacations for 2 years have now (mostly) taken them. There's going to be a natural lull after that peak.
Also, we saw huge price increases over the last 2 years. Even with discounts, someone who last took a WDW vacation in (say) 2018 is in for some serious sticker shock.
Finally, and as Park Chairman Josh D'Amaro has suggested, recent changes making a WDW vacation overly complex to plan probably are turning off a few.