When they did some extensive maintenance to the Intrepid a few years ago, they had to tow her to the yard. She had been there (Manhattan Pier 86) I think around 25-years, about half the time as this one. Unfortunately, when they tried to move her she wouldn't budge because of the silt and mud that had built up over that period of time. It took over a month just to drudge enough material to allow her to actually float away.
That problem is probably exponential worse with the Olympia.
The Olympia is 5800 tons displacement compared to 33000 tons for the Intrepid, based on internet sources ... so less than 1/5 the size, basically. Also draft is 18 vs. 32 feet, AFAICT.
The big problem with Olympia is that she has to be maintained by Philadelphia union workers, which really jacks up the cost.