chwdrhed...
How many people do you know who have ever gone on an expensive cruise who would pay extra to rent a 7" video screen to view a 20th Century Fox movie?
My parents are avid participants in cruises (they've been on over 10 long-term cruises - as long as 6 weeks at a time). From their photos, videos and explanations of their cruises, I can not even begin to imagine that they would ever rent a portable movie/video device to view during their cruises. There are so many activities for them to participate in that it is impossible to believe that they would ever pay extra to sit and watch a movie on a 7" screen.
Maybe you know people who go on cruises who don't enjoy the cruise activities, so would prefer to rent a 7" screen video device that would let them watch movies that are only from 20th Century Fox (but not from any other studios).
Personally, of all of the people I know who enjoy cruises, none of them would be inclined to rent this IFE-type device.