No nuclear space arks, no jetpacks. Robot skateboards and butterflies that glow green.
We all forgot that the future is yet to be written. No-one knows how it's going to turn out. The best we can do is track the future as it happens, and use our fiction as a tool with which to understand where we are.
By the time you read this, everything in it will be history. The future's a moving target. That's why it needs tracking.
Warren Ellis (2009). Shivering Sands. International Electrophonic Unit.