I understand the desire to have a different ship. I was simply giving my thoughts (they did not ask me....) of the situation. New York will be (in the future) a seasonal port, they have tried to sail year round from there and for CCL, it does not work. Venezia fits the hole, the two small pools work in a climate where the pools (or lack there of) are part of the decision (my guess, have no insight, but it sure fits). Venezia also has a pool which can be covered. As we all know, this ship came from Costa and was originally built for the China market. My guess is pools are not a priority.
Your thoughts of a rotation are of course valid, but they have to consider whew each ship fits best. There are of course, other factors, persistency, capacity, profitability, customer reviews and comments and more which factor into the decision of which ship sails from there. That said, there is definitely history in the flipping of ships from one home port to another (also ones that stay put for years). all that said, I hope you get your wish.