The Klitschko Brothers will be remembered as - the two greatest heavyweights of all time - the two most dominant fighters of all time - having the two highest KO ratios of all time - H2H Monsters, they would dominate any era
The Klits will hardly be remembered at all outside Germany and the occasional Klan meeting. Too boring and dependent on each other to prop up their respective legacies (if you can call them that). If HW boxing doesn't improve after they are gone, they'll be remembered as the Euro-bums that killed the division.