Do you think the cruise lines will change the itinerary if this is one of the stops?
No. At least not any time soon unless the crime situation gets much worse. The major cruise lines have a vested interest in keeping Nassau open as a port call. Now, they will pull ports if a situation becomes a civil unrest situation as Penny mentioned concerning Honduras. They will pull lesser visited ports if cruise ship passengers and crew are continually targeted for crime. Carnival pulled St.Croix for just that reason several years ago.
The people of Nassau are in no way happy about these occurrences. They want it "nipped in the bud" as much as we do.
The Carnival Dream "should" dock as scheduled on January 17th.