Something that often bothers me is how when the stakes are high the Justice League often win and the world stays the same there is no big fall out and it's like all the struggle we see and revelations really don't add up to anything. I'd like to see something akin to Star Wars Order 66. Like a massive battle between Darkseid takes place all the heroes are fighting with the Earth's soldiers and it's revealed Trigon or someone worse than Darkseid has been plotting behind the scenes and sets up everyone on both sides to lose horribly like by the end the 4th world is permanently sealed off from the multiverse and heroes all over Earth are gunned down by mind controlled soldiers with things ending with Trigon controlling everything via a human disguise and the few suriving heroes forced into hiding and protecting the innocent in the shadows.
Part of why this concept intrigues me is I'm curious how survivors would change and if any would blame the mind controlled soldiers who gunned down their allies. At the same time I wonder how many heroes would be left broken by such an event especially after losing long time allies and friends.