Here's my plan (if I were Bob ready to free up some cash for WDW). No new 5th park, don't really need it. Just need higher hourly capacity. Before the FLE is done, I'd announce the following
First in line is DAK....right now there's lots of infrastructure not generating profits after 5pm (restaurants and shops). The Animal Kingdom is in need of a new land up front (where Beastly Kingdom was supposed to go) that can accommodate 3 to 4 new attractions that can operate at night without bothering our wild friends in the back of the park. The park also needs a closing spectacular that fits these constraints. If Bob's really throwing us a bone, a North or South America land with animals could be added behind Asia.
Second, DHS....two or three new ride through attractions are needed, no more shows right now.
Third, Epcot....rehabbed Imagination with a brand new Image Works and two new attractions for World Showcase (either in existing countries-or whole new countries). Cost would probably be less if they were add ons to UK, Morocco, Japan, Italy or Germany. Just make them people-eaters as Walt used to say. Capacity, capacity, capacity....
The Encore, MK....let's update Tomorrowland again, with two new worthwhile attractions and a BIG E Ticket somewhere else. Find a new corner in FL for the Princesses and throw a new dark ride in the old Snow White location. And again, if there's lots of cash, how about an Alice attraction built around and over the Enchanted Grove.
I know that's alot to ask for, but if all this were achieved, as Alladin said, we'd have A Whole New "Disney" World, for you and me.