Much of DHS’ attractions felt like filler. They weren’t going to last anyways. The creator of Indy show didn’t think it will last beyond a few years. It’s still here, which tells you more about Disney than the audience.Yes, and once they see an attraction with declining numbers they don't hesitate to start the ball rolling on the replacement.
That is why they keep growing.
If they wanted to save GMR and many Epcot rides that were done right, but became outdated, it would have happened a long time ago. Heck, GMR’s awful script needed to be changed decades ago. This is on Disney.