I'm booked on the Panorama leaving 12/2. It'll be my third time on this itinerary and I'd only booked Carnival excursions, so if this happened on my sailing, I'd be a little sad but would still have a great vacation. I'd probably take the OBC and the refunded excursion money and get a massage or something (though I think they're wildly overpriced compared to land spas). But I have unlimited PTO and didn't pay a fortune for the trip.
Even still, I will admit, I'm a little on edge at the possibility of a changed itinerary for my sailing. I like sea days, but if the whole ship is forced to stay onboard then things are going to be a lot more crowded than when it's just you choosing to stay on, which impacts the experience.