Widespread Space Travel: It's easy to chide Space Odyssey for its ambitious forecast of turn-of-the-century space travel, but keep in mind that the film was released in 1968, a full year before we faked the moon landing. Nobody could have guessed that the Soviet Union would forfeit the Space Race for fear of getting its dress dirty, and then finally collapse like a little girl. This deprived us the fruits of competition. Were the Soviets still tinkering around with satellites, we'd probably be colonizing Pluto instead of bitterly revoking its status as a planet.
2001 is often celebrated for its clairvoyance, because a few of its inane predications came vaguely true. But, the major plot elements still seem like crackhead visions of the distant future. And the movie's notion that we'd still have attractive flight attendants in 2001 now seems preposterous.