Network Drive Folder Consolidation

The network drive for the user community is full of folders, sub folders, documents, duplicate documents, versions of documents that are no longer relevant. I am sure we are not alone. Does anyone have a good plan to get a consolidation project going and methods to motivate the users to join in the consolidation? Should the project sit with the user community? in which case it will surely fail, or should it sit with the IT Manager? What are the best ways to manage future user requests for folder submission to the network drive?