But even if in the future its used in an area in which there could be ice, it's still incredibly rare for a cruise ship today to strike an iceberg. It's not impossible though.
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“every year, on average, more than two dozen large ships sink, or otherwise go missing, taking their crews along with them.” In a prescient comment, she says, “imagine the headlines if even a single 747 slipped off the map with all its passengers and was never heard from again”.
If, of course, the ship is too heavy (say it was filled with too much steel or other heavy stuff) then the weight of water displaced will never equal the ship's weight and it will never float (it will sink like a stone).
Over the past 100 years since the RMS Titanic sank in 1912, only 18 cruise ships and some ocean liners have been publicly known to have sunk. And, over the past 50 years, only four cruise ships have sunk while navigating on a cruise.