The only way I can see Dream Theater (as it exists now) losing their name is if a Yes sort of things happens, where James, John, Jordan, and John M. decide to call it quits, and years later the label brings Mike Portnoy and some other assortment of past members to talk about a reunion. You've got to admit: Mike Portnoy + any other two or three members from any era would be pretty justified in calling themselves "Dream Theater," especially if the band had called it quits anyway.