At this point MCO is still expected to re-open Friday morning. There could still be flight delays and cancellations though, depending on where planes physically are vs where they need to be to get from your city to MCO. However, if the airport and cruise port are both open, I wouldn't be particularly concerned about travel safety.
Any decision about cancelling or delaying a cruise is largely be based on the fact that Port Canaveral is currently still closed and and assessing for damage. Last I heard was a possible re-opening Friday or Saturday, not sure if there is a more current status. Assuming it re-opens in that time frame and
DCL can get docked on Saturday, I expect the Fantasy will go back out on Saturday. The Wish is extended to Sunday so they could get a day at CC (missed earlier this week due to conditions) and also they can't have 2 ships at the DCL terminal at one time. But it all depends on the port re-opening.