One of the most blatant examples of foolish political ideas by science fiction authors is Gene Roddenberry's idea that advanced civilizations would have no money.
I'm not so sure Gene was that far off the mark. If you think about it money is basically a bartering tool to assist with the distribution of scarce resources. If you reach a point where resources are no longer scarce (sometimes called a post-scarcity society) then what would be the point of money? You want a mansion, order it up! You want a rocket ship to fly to Mars? Submit the requisition and the machines build it out for you. Too crowded on Earth? Grab a new residence on the ring-world being built around Alpha Centauri. And on and on. The Culture series of novels by Iain Banks envisions such a society, and I have to say it makes a lot of sense.
The part where Roddenberry's idealism got ahead of reason was in thinking it would happen that soon. I get the sense that we're still at least 1000+ years away from getting rid of money entirely. But if we don't blow ourselves up and we keep on developing tech at the current breakneck pace, I would say we will definitely eventually reach a point where money is no longer a necessary concept.