What exactly is living world content?
Living world content is content added to forward a story the devs are telling. This content isn’t persistent, once the story is over and enough time has past, it will be removed.
The way it had worked in the past was a new LS episode comes out every two weeks and lasts for 4 weeks, this means that there is some overlap of stories during the period. Any special modified areas may last until all the chapters of the story is over. Areas like the Crown Pavilion arenas and the Toxic Tower in Kessex.
Why not permanent? It’s a way to get players to stay and do the content because it’s temp. You want some cool unlocked back piece or skin if you do all the achievements, well you have to do it while the LS is up. They can also throw in a few story related skins on the Gem Shop or other items (finishers) which are also limited time only.
Don’t worry, they are suppose to be changing it up after this conclusion to the Scarlet story.
RIP City of Heroes