I don't agree that ophelia really falls off.. you have the potential for 3 superior disables with skeletons, the ability to save heroes with W, especially if you have a stormspirit, and your Q lets your team blow up most heroes quite easily late game. Also many strong creeps exist the scale into late game.. Obviously most ophelias would prefer to end the game sooner than later but it is NOT useless late game by any means.