Indy has saved:
- Western Civilization from Nazis
- the children of a village
- whatever it was in Crystal Skull
None of those things were the heart of archeology. In fact, when it comes to the archeological thread of the story, Indy keeps failing to bring anything back to a museum (although, he did save the Hindu stone). Archeology was a reason for him to adventure in a story greater than retrieving an artifact. The adventure was greater than archeology.
Any future movie can have Indy using archeology to find himself in a situation where he is saving:
- dinosaurs in a lost world/island
- animals at the brink of extinction
- a huge ecosystem about to be destroyed by humans
And that would work for a plot for an AK attraction.
And really, you don't need a new movie to tell the tale of Indy saving dinosaurs, endangered animals, or the environment... the attraction itself can tell that story.