I've laid out exactly what I think needs to be done with DHS for a long time in vast detail, but i'll summarize once again that I think Muppets should either be better fleshed out by having an actual ride, or the area removed entirely. Indiana Jones Stunt Show can stay and be surrounded by an Indiana Jones land that includes an IJ ride using Pirates tech and the Paris coaster.
Lastly, rearrange backstage buildings (and knock down the parking garage along with the animation building) to connect TSL to RNRC and in the middle, add a land based on fantasy animated properties that currently are not represented in the parks such as Tangled (boat ride and snuggly duckling quick service), Up (Water ride), and Monsters inc (Door Coaster, Harryhausen's table service). Maybe Big Hero 6 as well.
Doing that would be putting billions more into the park, but it would ultimately finally make the park feel like a fairly full day park without having to expand into the parking lot yet. Even after that type of stuff, there's still plenty of room for expansion. People think DHS has no room, but with a little maneuvering, the park can have a pretty decent amount of land to work with, but this is years and years down the line.