Magic or Vista would probably be bumped to NOLA, Mardi Gras or Celebration would probably move to a shorter run 3/4 day (I would think).
If they toy with bringing one up to NYC for a summer season, that bumps Venezia else where.
Wouldn’t that have taken place by now? All 4 are getting lengthy dry docks, with them rotating to Europe. They are past the age, the Destiny/Triumph Class got their respective makeovers.