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For a genre that’s about looking to the future, science fiction has sure been looking backwards lately. Nostalgia is what sells best, with readers spending their money on movie tie-in novels and sequels to long-running series. Yes, there have been trailblazing new sci-fi books (as a look at the past few years of Hugo winners will attest), but more readers seem to prefer established universes like Star Wars and Dune. Even the writers who have broken through have benefited from a sense of nostalgia – series is unapologetically Heinleinian, a touchstone to the glory…