HH6702
I think you could be spot on! Of the bases left operating the Boeing (LTN, BFS & NCL) I think it would make a lot of sense to convert NCL to the Airbus at a time when demand is at its lowest.
By reducing ac from 7-5 during the winter for say Oct-Jan, that would allow 10 crews (2 ac) to be re-trained on the 319, before ramping it back up to a 7 ac base for the start of summer 2008, with it being all Bus by July/Aug.