NO attraction should go. But I agree with all saying that the American Plunge needs some love. I have no idea why they would not keep this ride updated or give it a major facelift. It gets a lot of visitors and could get many, many more. I rode this past summer with my nephew and niece and it was almost depressing compared to what it used to be. I almost felt sorry for them that they could not experience the Plunge the way it used to be.
That being said, don't necessarily CHANGE the AP. It should always, always be called the American Plunge. It should stay in the same theme. It just needs to be updated...all the water effects, characters along the way. You used to really get a sense that these groups tried to take the plunge and failed. Now it's just random stuff that doesn't work during the (way too short) float trip part of the ride.
Update the Plunge! Keep all the rides! Give them some love! The money is there, and so are the riders.