So, anent nothing in particular, I was contemplating another of James Nicoll's essays on Tor.com the other day—this one concerning utopias in SF—and found myself trying to stare into my own cognitive blind spot.

Like all fiction genres, SF is prone to fashion trends. For example, since the late 1970s, psi powers as a trope have gone into steep decline (I'd attribute this to the death and subsequent waning influence of editor John W. Campbell, who in addition to being a bigoted right-winger was into any number of bizarre fringe beliefs). "Population time bomb"/overpopulation stories have also gone into decline, perhaps due to the gradual realization that thanks to the green revolution and demographic transition we aren't doomed as a direct consequence of overpopulation—climate change and collapsing agriculture are another matter, but we're already far past the point at which a collapse into cannibalism and barbarism was so gloatingly depicted in much 1960s and 1970s SF. And so are stories about our totalitarian Stalinist/Soviet overlords and their final triumph over the decadent free western world. These are all, if you like, examples of formerly-popular tropes which succumbed to, respectively, critiques of their scientific plausibility (psi powers), the intersection of unforeseen scientific breakthroughs with the reversal of an existing trend to mitigate a damaging outcome (food production revolution/population growth tapering off), and the inexorable historical dialectic (snark intentional).

Oddly enough, tales of what the world will be like in the tantalizingly close future year 2000 AD are also thin on the ground these days. As are tales of the first man on the moon (it's always a man in those stories, although nobody in the 1950s thought to call the hero of a two-fisted space engineering story "Armstrong"), the big East/West Third World War (but hold the front page!), and a bunch of other obsolescent futures that were contingent on milestones we've already driven past.

Some other technological marvels predicted in earlier SF have dropped out of fiction except as background scenery, for they're now the stuff of corporate press releases and funding rounds. Reusable space launchers? Check. (Elon Musk really, really wants to be the Man who Sold the Moon.) Space elevators/tether systems? Nobody would bother writing a novel like "The Fountains of Paradise" these days, they're too plonkingly obvious. It'd be like writing a novel about ITER, as opposed to a novel where ITER is the setting. Pocket supercomputer/videophone gadgets in every teenager's pocket? No, that's just too whacky: nobody would believe it! And so on. (Add sarcasm tags to taste.)

We are living through the golden age of grimdark dystopian futures, especially in Young Adult literature (and lest we forget, there's much truth to the old saying that "the golden age of SF is 12", even for those of us who write and read more adult themes). There's also a burgeoning wave of CliFi, fiction set in the aftermath of global climate change. We're now seeing Afrofuturism and other cultures taken into the mainstream of commercial SF, rather than being marginalized and systematically excluded: diversity is on the rise (and the grumpy white men don't like it).

Which leads me to my question: what are the blind spots in current SF? The topics that nobody is writing about but that folks should be writing about? (Keep reading below the cut before you think about replying!)