Europe maybe not, but places like Honduras would be worse off without them.
The industry and shipyards are advancing technology in ways that other industries do not. New ships use LNG, batteries and renewables. A carbon neutral cruise ship is not too far away.
The intensive childcare offered allows parents who cannot otherwise get such services to relax.
Pixar's Wall-e was prescient in that most people would choose to live this way.
The demand for cruises is not going to go away.