-PJ
No museum ships would be operable without months of work.
Anyway, The Bataan is on its way; obviously all Naval vessels fled the area because of the storm, and they generally cruise at about 20 knots, so it's not like they can suddenly teleport in to New Orleans.
sw
CNN just showed a prison that is flooding. Cars in parking lot covered with water. Prisoners sitting on roadway.
How about all those cruise ships that moor in Miami?
Maybe they could get people on ships and send them to a port in Florida or Texas, where they could set up refugee camps?
As for decommissioned ships, the typical procedure once they get beyond a certain age is to strip certain things from it and secure all the openings. In essence, nothing Really Big has been decommissioned in the past year, so it would not be a viable option to try to use them for people storage (CV 64 Constellation is already far advanced in the post-decommissioning process).
For the long term, since CV 67 Kennedy was on the path to decommissioning and not in Navy's main game plans any more, that might be used as a backup, but IMO it would be more likely that once the military ships find a safe channel for passage, the Comfort might move ((as an MSC ship, it uses much less crew)).