Changing an itinerary is a possibility, though it really depends on a few factors such as, how big the storm is, where it is, and where it is predicted to be. I was just watching it on the 500 news and there saying theres a lot of uncertainty with it. Tom it could be a different story. Matter of fact, it just came back on and there saying there is very weak steering currents.
Just to give a hypothetical situation, assuming it does basically circle around Yucatan, if the storm is say 200 miles across,(width) and Coz is say 400 miles from the center, theres a 300 mile buffer, of nice weather,from the edge of the storm, to the port, in which case
DCL will watch it, and not do much of anything.
If Coz, is say 100 miles from the center, and the storm is 200 miles across, and they are forecasting 20 foot waves,with 30 mph winds, they could change Coz to somethng else, like say Jamaica, and keep Grand Cayman. Or they could reverse Grand Cayman and Coz depending on what they think Paula will do. Ill be keeping an eye on it, since they tend to talk about it here in Fl, regularly. NHC will put out a statement every 4 hours on it till it dies.