Disney is a business, not only does it charge "what the market will bear" it also has an internal balance sheet. They are building more rides, whole lands, more hotels, more restaurants, etc... The labor market is tight. And, of course, Disney isn't just the theme parks; in short they have to go over the balance sheet as a whole, and being a public company means they are attempting to do all of this whilst making shareholders happy. It's not a one-to-one correspondence as far as "cutting hours." They also offer the add-ons which results in running some parks later. Are they charging more for those things that used to be "free?" Yup. They are also at the mercy of the economy just like anyone else, both up and down.
The main issue wasn't what they charge, but rather how to control crowds. Extending hours isn't going to manage the crowds that people are complaining about; if you go late at night, right before close or you go early early in the morn, the crowds aren't a problem now, which means the majority of Disney goers are not staying out past a certain time, nor are they all going to rope drop. It's the crowds in the middle of the day that need managed, which is why I believe they are now turning to FP to try to manipulate the lines.