I predict that the Jones act will be repealed. This is the law that prevents foreign-flagged and staffed ships from cruising only US ports.
I also predict that more lines will include at least soft drinks and water, without additional charge. And some will (and have) added all drinks on the "included list".
Finally, I predict that along with the increase in "mega ships" there will be an increase in the number of small "boutique" ships.