It's interesting to hear Clarke discussed on the subject of (in)accuracy of predictions. I feel like Clarke's stories stand out from his contemporaries as having a notably clearer view of the world that was coming, at least on the issues I find most interesting. Golden age and New Wave age SF stories have a tendency to imagine vast technological changes with little consideration as to the social changes that accompany them. So you end up with stories about suburbanites with husbands who shuffle off to an ill-defined office leaving their homemaker wives, except their new gadgets are time distortion fields instead of color televisions. Or stories go the other way and present societies so different it is hard to recognize them as human.
Clarke wasn't perfect, but he saw that the genders were going to become more equal. His stories don't necessarily reflect that equity in terms of choice of protagonists, but gender-equity of the future is usually noted in the stories. In this story, the fact that the great manufacturing centers of the midcentury were going to depopulate sounds quite precient. In 1946, when this story was published, the population of Detroit was about 1.8 million. Today it is 713,000. It wasn't the helecopter that did it, and social inequalities keep it from being quite the pretty process Clarke suggests, but his vision of cities that tied to physical manufacturing being left comparatively empty by the march of society is very real. In another generation or two, information technology might put us close to the rural-technological society Clarke envisions.
At the same time, Clarke's humans are very recognizable. Scientists in Rendevous with Rama squabble about pet theories and the advanced space fleet that exists at the beginning of the story only exists as an after-the-fact reaction to an earthly disaster. It is easy to assume that technological progress will just happen inevitably, but Clarke got that huge investments require huge motivations. As in this story, Clarke, unlike many or most classic SF authors, recognized that people and governments need a reason to invest the enormous resources into space.
I don't think it is SF's job to accurately predict the future and obviously Clarke doesn't. But I think the strength of his stories is that he asks the right questions. What would make people launch themselves into the void? What will human societies and relationships look like as transportation technology continues to advance? What would a higher stage of consciousness mean? The questions he asks makes him better at seeing the future of people and the technology they create and that creates them, but more importantly makes him a great storyteller.