As part of Phase 2 of the park’s overhaul, Disney would demolish both The Seas and The Land pavilions in favor of new offerings. This would not be a reutilization of the existing pavilions, rather, both would be completely bulldozed.
According to internal documents, both pavilions would be closed forever sometime between 2024 and 2026. What exactly will replace them in Future World is unknown at this time. All that we know is that the removal of both is already tentatively scheduled.
The Seas with Nemo and Friends houses a dark ride featuring the Pixar characters, Turtle Talk with Crush, and a number of sea life exhibits (including the beloved dolphins and manatees). These offerings would all likely go away at that point.
While plans can change (especially with many years left before Phase 2 begins), this is a disheartening bit of information about two beloved pavilions at Walt Disney World’s Epcot.