I agree that the attrition of lack of parts would grind the navies to a halt. Without petroleum and parts most heavy machinery will literally grind to a halt. The bigger the machine the more maintenance it would need.
I could see a number of ships more or less mothballed in scattered ports around the world. The ship is afloat, may have some armaments, and could influence the local region but is probably not capable of offensive actions.
These ships could be great strongholds. Tough to capture, but could hold a wealth of gear.
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