I think an appropriate follow-up to Brave New World is Ayn Rand's novella, Anthem. Written in 1937, Rand's story shares some noticeable similarities with Huxley's earlier novel. However, for Rand, the greatest problem in the apocalyptic future is the loss of individualism. Huxley certainly alludes to this problem, but it is absolutely the central issue in Anthem.
Right away, readers learn that the word "I" has been removed from society's vernacular. The narrator refers to himself as "We," which can be a bit confusing but has a powerful impact on the reading. We also learn that nobody has an individual name. People are identified by an idealized noun like "Equality" or "Liberty", followed by a serialized number. As in Brave New World, babies are raised without families and later assigned their occupations by the government. The narrator then guiltily confesses his great sins of spending time alone, forming a friendship, and writing down his thoughts.
Despite the similarities with other apocalyptic literature, Rand has nevertheless explored this concept in a unique way. She takes notions that are essentially good in concept, such as equality, and illustrates what would happen if such concepts were actually fulfilled. Equality, for example, is a nice idea. We would like to think that everyone is equal. However, Rand shows that having a preference for some people over others is not only good but necessary in our society. A friendship, for example, means that you like someone more than most people in the world and enjoy spending time with them in particular. Likewise, a romantic relationship means that you prefer one person more than everyone else and want to be with them alone. Rand also shows that allowing for differences in people is fundamental for progress. When we are allowed to be individuals, we can be leaders and inventors. On the other hand, when her protagonist brings his potentially life-changing invention to the House of Scholars, he is scolded and rejected because he dared to think of something on his own.
I have to say that this book caused me to rethink some of my beliefs. I have often been critical of the severe individualism in our culture, which I think has affected politics, community, and religion. And although I still think these effects have some detrimental aspects, I feel more strongly that individualism in its essence is a good thing. There is something beautiful about the discovery of the self or "ego" in Anthem as the protagonist continues to push the boundaries of his society. His friendship and romance are pure and inspiring. His courage and innate leadership are challenging and wonderfully admirable. It's quite a short story, but I think it nevertheless holds some important truths and demonstrates a future apocalypse without people's vital senses of individualism and identity.