Not really jumping ship: we have an upcoming DCL cruise in 4 weeks and I expect to book another for 2018.
Our next cruise will be on Royal Caribbean's Allure of the Seas. The family wanted to try something new, but the price also surprised me:
Allure of the Seas, 7 day Eastern, October 15 2017, 2 bedroom "Aquatheater suite" (823 sq ft + 772 sq feet balcony), 8 guests, concierge lounge, free drinks, $300 onboard credit: $14,593 + insurance.
Disney Fantasy, 7 day Western, October 14 2017, 1 Cat V stateroom (306 sq ft), 5 guests, and 1 Cat T suite (662 sq ft), 3 guests, concierge lounge: $22,334 + insurance.
We're privileged to be able to choose between the two, but it is hard to justify DCL when most of the family, especially the kids, are more excited about the first option.
My own guess is that the prices for the Dream class ships will take a temporary dip when booking for the first new ship starts ~3 years from now. With so many exciting new ships being launched by other lines, it just seems like a good window to try something different.
PS: The week of October 15 next year is school vacation in Scandinavia.