It's also clause 28 of the Booking & Passage Conditions online.

It qualifies "significant change" with

"For the purposes of this clause, 'significant change' means a change to the city of departure or disembarkation, or to the majority (by number) of the other ports in your itinerary."

So they might have wiggle room there, unfortunately.

Makes you wonder about the other ships in that class too. Are they likely to develop similar problems? We're booked on Sun Princess for Christmas.
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Aug 2018 - Crystal Symphony - Panama Canal from San Francisco to New York
Mar 2018 - Diamond Princess - Sydney to Yokohama
Sep 2017 - Royal Princess - Mediterranean
Feb 2017 - Celebrity Solstice - Auckland to Sydney
Nov 2016 - Carnival Legend - South Pacific
Sep 2016 - Sun Princess - Papua New Guinea
Apr 2016 - Golden Princess - Sydney to Hong Kong
Dec 2015 - Celebrity Solstice - Auckland to Sydney
Aug 2015 - Dawn Princess - Top End Fremantle to Sydney
Mar 2015 - Rhapsody of the Seas - South Pacific
Dec 2014 - Sun Princess - South Pacific
Sep 2008 - Avalon Tapestry - Rhine Cruise