Unfortunately, I don't have any good answers. Your guess is as good as mine. I am pretty sure that ports are definitely going to be evaluated on a case by case basis. And, like the pp said, the port cities themselves may have restrictions the cruise lines will have to work around.
I'm personally scheduled for a double-dip in November, so I am feeling relatively confident that ports won't be massively affected. Either we stop at Nassau, or we don't. My guess would be it would be an extra sea day. But, since 2 of the port days are at
Castaway Cay, Disney has control of a large majority of the itinerary.
@Cheburashka. shoot....Key West was going to be my suggestion as an alternative to Nassau or the Caribbean Islands.
Regardless of how eager the Bahamas are for tourism, I still think
DCL, and cruise ships in general, will be reluctant to stop there. Considering how crowded the areas close to the dock are, and considering I don't have high confidence that the people of Nassau, specifically, have been strict about sanitizing and social distancing....I personally wouldn't feel comfortable getting off the ship there. I imagine many passengers feel the same way.
I suppose I could see a scenario where it's sort of a "closed loop" excursion process where, they dock at Nassau, and people are able to get off and go on excursions that are in a much more controlled environment and steps can be taken to prove that measures are being taken to be safe. Other than those specific excursions which Disney can sanction as "acceptable," no one would be allowed off the ship. That's a possibility.