Yes, it would make more sense to move Deliziosa and Diadema over and have Magica and Serena fill in. They had to cancel 6 months of Diadema sailings, so I don't think the downgrade would be a problem. There would be a problem with this though. Deliziosa does a world cruise, and I don't know if Magica or Serena could fill in, maybe.
After looking at Deliziosa's world cruise, here are a few things I noted:
- It starts in early January so this change would have to happen soon, it can't switch cruise lines mid cruise
-It goes through Panama Canal. Deliziosa can fit in the old locks, Magica and Serena can't. They can fit in the new ones, but I don't know if switching which locks this cruise goes into is a problem
Maybe it is better for Serena and Diadema to come to Carnival. That would keep Deliziosa doing the world cruise and emliminate a one ship class in Costa.
or/and
Delizosa could switch to Carnival and take its world cruise with it. Maybe a Carnival Deliziosa world cruise would sell better than a Costa Deliziosa one