DC's announcement of the Death of the Justice League means the entire Justice League team of superheroes will die while fighting a nearly-unstoppable foe - which is eerily similar to the plot of Avengers: Endgame. The Marvel Cinematic Universe box office hit is, as of 2022, the second highest-grossing film of all time, with an estimated $2.978 billion (and perhaps more if one considered viewings via Disney+ subscriptions). But the Death of the Justice League has seen Endgame's success and clearly wants a piece of the world-ending pie.
In Avengers: Infinity War, all of Marvel's superheroes take on Thanos, the Mad Titan, who seeks to eliminate half the population of the universe by using the six Infinity Stones. Each one contains phenomenal power, but together, they can rewrite the entire reality of the universe (and kill untold trillions if the user decides to do s0). Shockingly, Thanos actually succeeds, and half of all life disappears - including half the superheroes. Characters like Star-Lord, Doctor Strange, Spider-Man and others turn to dust and disappear, forcing the original team of Avengers to band together for one last mission to save the universe in Avengers: Endgame.
The Death of the Justice League plans to tell their story in a markedly different way. Almost all of the core members of the League - Superman, Batman, Wonder Woman, the Flash, Aquaman, etc - will die and only one survivor will return. This means that the second-tier heroes, such as Starfire, Batigrl, Cyborg and more will be forced to take up the slack of the major players of the League.
It was heavily rumored in the lead-up to Avengers: Infinity War that most or all of the core six Avengers would die, forcing the new heroes to band together to save the day, even though they've never worked as a team before. That wasn't the case, and the newer heroes were "snapped" away; this led to the well-received Time Heist section of the film in which the Avengers revisit their pasts. But Death of the Justice League, perhaps, has seen that these heroes are quite set in their ways and needs a dramatic shake-up in order to make the book more interesting.
Comic book readers are under no illusion that the likes of Superman and Batman will be gone forever; the nature of comic book deaths means they'll all be revived within a year or two. But this is nevertheless a massive step for DC Comics, who have followed in Marvel's shadow in terms of comic and film sales. Perhaps the Death of the Justice League could be the shot in the arm the team so desperately needs.