I believe Allure is the big experiment and that is staring this fall vs next summer. Allure seems to be selling well enough already to warrant Utopia possibility sailing out of Canaveral. If it was not selling well enough here, I do not believe Royal would put Utopia here. Instead, they would have put it elsewhere and kept the Allure doing the 3/4-night run.
Just look at the history of Royal's 3/4 night program out of Florida over the past few years when they finally committed to using larger ships for that program such as the Mariner. They took the big leap having the Mariner do it out of Miami. And when they got data and feedback that it was doing well, they brough another voyager class ship over to Maimi (Navigator of The Seas) and moved the Mariner to Port Canaveral Florida. Out of Canaveral, Mariner sailed pretty much full just about every three night cruise. It got to a point where after the restart, that they then decided to put two freedom class vessels (Indy & Freedom) doing the 3/4 night program and that still to this day is wildly successful.
So having a Oasis class do the 3/4 night program is a very logical next step.