From my review in Taki's Magazine of the fine time-travel movie Looper, with Bruce Willis and Joseph Gordon-Levitt playing a hit man from the future at different ages:
One irony about dystopian sci-fi and comic-book movies is that although leading men may be slightly East Asian-looking in the future, America's slums will apparently be mostly white, with everybody else black. Much like in The Matrix, Hispanics don’t exist in Looper’s vision of America in 2044.
While climate change is a favorite subject of sci-fi movies, demographic change is not. With the exception of Blade Runner (set in an Asian-dominated Southern California) and, to a lesser extent, Idiocracy (where America in 2505 is about as Mexican as Texas in 2005), sci-fi movies have shown little interest in projecting out current trends in ethnicity.
Read the whole thing there.