USS Arizona
Would it have been better for the superstructure of the Arizona to be left in place rather than be removed to the deck? This would have more of an effect on visitors. They would see what the servicemen endured at the attack. The Superstructure would have to be reinforced for safety purposes as sea water would eventually eat away at its support, though.
Titanic has 29 years head start on rusting away. Eventually both will be no more. A pile of rust under the memorial visitor platform.
I know the Memorial was years into the future.