So we all know DHS could use some major help. I was looking at the park map and thinking what I would do with Billions in mind (which it really needs AFTER SWL and TSL) for the park. By 2019 (or whenever SWL opens), the park will have 9 rides and 5-6 shows.
Here's what I would do (can you tell I can't sleep??):
1. Bulldoze the animation building and the adjacent parking garage (yes, the one they are currently hiding). Move all operations run out of the animation building and all offices to elsewhere on property.
2. As a segue from Toy Story Land, you would enter a Monstropolis themed area where you would find the Monster's Inc. Door Coaster and Monster's Inc. Laugh Floor. Both would take up a rather small amount of space. Perhaps there would be a B-ticket type ride as well. Moving Laugh Floor would free up space in Tomorrowland as well. Harryhausen's would be a table service restaurant in Monstropolis (Japanese Restaurant).
3. From Monstropolis, you would walk behind where The Little Mermaid show currently sits to give you an idea of where we are. The Little Mermaid show would be updated to the DCL version of Tangled: The Musical. Then opposite of the theater would be a Tangled boat ride, filling a park need... a ride for all ages and the lack of a boat ride in the park. The Snuggly Duckling would be the quick service in this area.
4. By this point we are starting to run out of room as you have to take backstage space into account. So last in this area would be an Up-based Paradise Falls Rafting Adventure Ride, filling another park need, as DHS doesn't have a pure water ride either. This ride would be far longer than Kali and would be extremely well themed.
Since this would be built completely on backstage land, it's a true expansion and a gain of 4 rides (all exclusive), 1 new show (replacement) and a attraction moved from another park. Also 2 new restaurants, 1 QSR and 1 TSR.