Muddiest Point 4

This week's muddiest point comes from metadata scheme; when a community defines a scheme for the metadata, would it be beneficial for it to be changed when a better type of scheme is introduced indirectly? For example, if an archives uses a scheme for many years and their metadata is all that type, would it be beneficial for that archives to change all of their metadata to a new format that is better for the archives storage and retrieval? Or would it be something that just wastes time and energy for the archives?