I found this site which collects the top movies that prophecies a dystopian future. dystopia is the opposite of utopia whereby the world descends close to chaos.
http://snarkerati.com/movie-news/the-top-50-dystopian-movies-of-all-time/
some of my favourite sci-fi flicks are in the list including blade runner, minority report, the matrix, twelve monkeys, serenity, ghost in the shell, akira, gattaca, dark city etc.