If Rolls-Royce is right, they'll be pulling into the Port of Seattle in the future:
A ship that does not have to accommodate a crew for weeks on end can dispense with many if not all the life-support systems needed by humans, from the galley to the sewage treatment system, the accommodation area and the deck house.
Removing these would not only leave more space for cargo but would also mean lighter ships, holding out the prospect of big savings on fuel bills, which account for about half of a ships total operating cost.
Lest you get too sentimental about the days of seafaring humans, the article claims that fewer and fewer humans want these jobs anyway. Because, it says, "the romance has gone out of life on the ocean."