A lot of the endless do mention that the area used to be open to living beings (presumably before the barrier around Alexandria went up) I can see them maybe resorting the actual zone and repurposing it for living beings as with the key out of the picture the gate is just a stable portal into living memory (or alternatively they may manage to open the portal on the top floor of the everkeep again and return it to Alexandria)

The problem was never the maintenance of the zone it was the fact that the endless required living human aether, living memory could 100% be used for something for living people

But if not I’ll just turn on NG+ whenever I enter that zone, I already have a ShB NG+ saved for kholusia everlasting light as kholusia looks ugly under normal light