I'm not sure how much room there is for expansion within the current realistic boundaries of the parks, at least without getting rid of things (my preference).
At AK, maybe some expansion behind Asia but not sure what is developable versus what needs to remain wetlands, etc. -- plus the more filled-in wilderness nature of it is a positive, not something they should raze more areas to fill in with rides, IMO.
Hollywood Studios, they could expand more into parking lot areas today, like the Olaf lot, but interested to see how Monstropolis turns out first before building another new land. Hopefully it happens at some point though. In general, a lot of newer things in this park though.
Epcot has a lot of room for at least another country pavilion with a great ride -- a lot of space between Germany and China, in particular. I hope this is what is up next after the current wave of announced builds. Could also replace Mission Space, Figment, others.
At MK, like or or not but this park has the most potential for expansions or new attractions, because it has the most old, crappy things today. I think they need to stay on/accelerate the path of getting rid of more old rides and doing more full overhauls, nostalgia be damned.
- Once Thunder Mountain is back online I hope they do a full redo of Space Mountain too (or just replace it), and frankly just a full overhaul of Tomorrowland. Speedway takes up way too much space and has abysmal capacity and has got to go.
- In Fantasyland, Peter Pan is old and has terrible throughput and should be replaced. Once Villains Land is open, there's no way to justify keeping It's A Small World -- yes, it has high capacity but that will be eaten up by all of the new rides being opened and it just takes up way too much space that could be used as a critical expansion/connection to Villains Land from Fantasy Land (and could include another ride, or two) -- doesn't hurt my case that it's also completely insufferable. Winnie the Pooh and Mad Tea Party could free up more real estate as well.
- Then the question is does Adventureland get a nostalgia pass for Pirates and Jungle Cruise? I could see them both staying the longest, given popularity and decent capacity. Would rather see everything else in that Adventureland/Frontierland complex go. Why they spent the time updating Country Bear Jamboree instead of just replacing it is beyond me. Tiki Room, Carpets, Swiss Family Treehouse, it can all go. Edited to add, fully replace Liberty Square too.
- Storybook Circus is trash, but I guess you need some of this for the littlest kiddos. Maybe some new swaps could be worthwhile, but way down the priority list.
End rant. Lol.