What do you think about this: what if the future spot of WoL/Play was devoted to a type of travel?
It could tie the area together. Think about it; you already have vehicular travel, space travel, and time travel.
You could do aviation, although the park already has Soarin'. You could do sea travel, but the park already has The Seas with Nemo and Friends (cringe). However, the former focuses more on the landscapes and the latter focuses more on the creatures within, so this option could focus more on the technology.
Not trying to do arm chair Imagineering, but just thinking about what could work here and bring it all together, given their new direction with World Discovery.