There's human input all over thus, from the algorithm creation to the curating, so I'm not sure this spells the end of art any more than Jackson Pollock using gravity and serendipity to determine where the paint ended up or Renaissance fresco artists having entire studios to generate "their" art. Or the invention of the camera.

Whilst it's aesthetically pleasing in a semi abstract kind of way and you can definitely imagine people paying to put it on their wall, nobody's going to confuse it for the actual human created film posters, so I think the people that make film posters for a living will be just fine (unless all future film directors and promoters want their film posters to be a collage of objects from the film on a psychedelic abstract background, I guess)