I thought Children of Men was quite realistic, actually. Maybe you could question the initial premise of fertility problems, but the rest of "what would happen

I thought Children of Men was quite realistic, actually. Maybe you could question the initial premise of fertility problems, but the rest of "what would happen if this happened" (societal unrest, surveillance, etc.) I found exceptionally realistic and very much in the "mood" of the modern world. It is miles more realistic than immortal space robots and a post-scarcity society.