Walt Disney World is constantly updating its attraction line-up - building new rides, and removing or updating old ones. We've taken a detailed look at the resort's "lost" rides in this series of articles. Inevitably, some of the current rides, attractions and other elements at Walt Disney World's four theme parks are in line for the chop over the next few years. Some might survive in an updated form, while others will be removed altogether. Though we don't have many official announcements to go on (yet), we can make some fairly strong guesses as to which attractions might be set for the axe. Let's take a look at five endangered Walt Disney World attractions.

5. Soarin' (Over California)

We love Soarin', the flight simulator attraction at Epcot that is a clone of the original (Soarin' Over California) at Disney California Adventure. The ride system is unique to Disney, and provides an amazing sensation of flight. Unfortunately, the frequent, jarring cuts in the ride movie undercut the feeling of immersion - and the California-focused ride video makes a lot less sense as part of Epcot's The Land pavilion. That's why we're excited about the planned replacement of the original, California-themed footage with a new movie that takes in scenes across the globe. If Disney can ensure that the edits are smoother, this could take the ride to a whole new level - just as Universal's HD makeover for The Amazing Adventures of Spider-Man breathed new life into that classic attraction. The latest rumors suggest that the updated Soarin' Over the Horizon could open as soon as 2016.

4. Captain EO

We understand Disney's decision to bring back Michael Jackson's 3-D extravaganza Captain EO in the wake of the singer's death. Not only was it a fitting tribute to the late star, but it also solved the problem of what to do with one of Epcot's aging attractions - Honey, I Shrunk the Audience. However, it only postponed the inevitable task for Disney of replacing Epcot's 3-D movie with something more modern. At present, it is not all clear what might happen to Captain EO. There have been rumors of Disneyland's version being replaced by a 3-D Star Wars movie - although that would be need to be clearly differentiated from Star Tours: The Adventures Continue (which itself is in 3-D). But Disney's Hollywood Studios would be a more fitting home for any Star Wars-themed shows. There have also been rumors that the entire Imagination Pavilion, which hosts Captain EO and the much-maligned Journey into Imagination with Figment, could be closed altogether. Even given the gaping gap in quality between the pavilion's attractions and the rest of Epcot's line-up, we find that hard to believe - but we do think that a major shake-up is in order, and will happen sooner rather than later.