When you consider any consumable object or idea, it’s very likely replaceable. A chair may cease to exist in the future because everyone uses an exoskeleton which allows them to take a seated position without any other support.
So what can’t we replace? Art is irreplaceable. No matter how much you innovate on art or music, there will always be a way to create different art or music. There will always be a way to entertain the mind.
As long as there is consciousness, it will always need occupying.