Main Street USA: This land should stay mostly as it is. However, the Soundsational parade needs to go. The floats are boring, the soundtrack is not pleasant to listen to, and it just feels tired. I would also be fine with a new castle, but only if it improves upon what's already there. Something similar to the Le Chateau de Belle au Bois Dormant in DLRP would be really nice.
Adventureland: Indiana Jones should stay as it is, as should the main show of the Tiki Room. However, I think that the preshow would be much cooler if the stationary figures of the Tiki gods were replaced with full-blown Audio-Animatronics. The Jungle Cruise scenery can stay as it is, but those animatronics need to be given more realistic movement. Tarzan's Treehouse should be removed. It doesn't have any appeal, and all of the space it occupies could be put to much better use. Aladdin's Oasis also has to go.
New Orleans Square: Take all of the PotC franchise stuff out and get rid of the new bride in the Haunted Mansion.
Critter Country: I think that Winnie the Pooh's space could be put to much better use. The storytelling in Winnie the Pooh (both American versions, and the Hong Kong version) have really cheap effects for the time they were made, and have clumsy storytelling overall. Reopen the Country Bear Jamboree with all three shows.
Frontierland: All of that space on Tom Sawyer Island could be put to much better use. Keep the space used for Fantasmic as is, and theme the rest of it to an old mining town, maybe with an attraction similar to Mine Train Through Nature's Wonderland. Big Thunder Ranch is also useless, as is the Golden Horseshoe with no real quality show to make it worth the subpar food.
Fantasyland: Just update the dark rides like TDA did to Alice in Wonderland. Take the space where the old Skyway building is and put an attraction or restaurant there.
Toontown: Update Roger Rabbit's Car Toon Spin like how Alice in Wonderland was. Get rid of Donald's Boat, Chip and Dale's Treehouse, and Goofy's Playhouse. They take up so much space that could be put to much better use. Replace them with a more family-friendly version of the Toon bar in Who Framed Roger Rabbit.
Tomorrowland: Get rid of all of the remaining structures of former attractions (Skyway building, Peoplemover track, etc.). They have no purpose and take up so much space. Gut Autopia and Innoventions. Those two attractions are just giant wastes of space. Take out Captain EO as well.