Right Sherry - let's stay positive! Right now I think we are on the "mystery cruise" - and waiting anxiously to find out where we'll be going - cause it seems pretty obvious that we won't be making Cozumel. I'm just really hoping that we don't miss Grand Cayman - I've been trying to get there for years and something always happens. 
Our family has been chatting about what we think will happen. My sister predicts they will reverse the route and hit Cozumel last. My brother-in-law is hoping for a swap to an Eastern Caribbean itinerary because he'd like to see the Virgin Islands. Parents are just hoping to avoid choppy water. I'm betting that they'll skip Cozumel and replace with something like Half Moon Cay or San Juan or just another sea day, then sail around to Jamaica and Grand Cayman (because hopefully by Wed/Thurs the waters will be calm there.) I'm also praying that they don't take us to Nassau or Freeport because I've been there twice and really have no desire to go back.
It may be a mystery cruise right now, but at least we'll be cruising!