The bones have more been broken with a lot of basic, poor design choices.
I used the term fixed loosely. But the cores of most parks have been sufficiently messed with that they won’t go back and edit hubs, entrances or night time auditoriums for a while. There seemed to be a lot of wastage of expansion project budgets on non-attraction infrastructure.
Save maybe Tomorrowland in Disneyland and a few one off attractions in WDW. There’s not a lot of major projects that will come up with no added expansion moving forward. Which might mean there are no future projects for a while…