Eternals is the latest film belonging to that great, teeming, not-so-riotous achievement in cross-platform multi-vertical corporate synergy/narrative cat-herding known as the Marvel Cinematic Universe.You perhaps read the above and rolled your eyes. Maybe you muttered something unkind under your breath as well. If you didn’t, you assuredly know someone who did. That’s just simple statistics: Superhero films have become our cultural furniture; they’re the steady, unceasing hiss of universal background radiation none of us can escape.And today, with the debut of every new film and television show, more and more prospective audience members find themselves aching to escape, to rid themselves forever of these children’s characters and their microweave pajamas and their hypertrophic musculature and their too-tidy, infantilizing morality tales.It’s not a backlash, really, because backlash suggests a reflexive reaction driven by a sudden, overwhelming need to reject, to force out, to detoxify…