This summer PC is the Wish/Treasure/Magic. I think the Magic and Treasure are doing well....it's the Wish that's struggling. Part of that is the Wish is pricey and the Magic is running similar or better itineraries for about the same price or a little more.
Looking at cruises my February break week, just comparing the Wish and the Fantasy, the Wish is included in the 50% off for guests 3 and 4, the Fantasy isn't. Far more availability of rooms on the Wish compared to the Fantasy (at least in the category/location I like to book. Deck 8 midship deluxe family oceanview.)
The system imploded when I went to look at the Treasure's availability.
Just one anecdata point