What about opening different sub plots/quests at different levels that offer a bigger challenge. They would require the use of different gear/buffs to successfully defeat creatures(NO 1 hitting) and when you entered the realm your gear was level capped or other such restrictions. This would give eoc players something new without totally excluding lower level players. It may also create more value in some of the gear that has become worthless over the years, especially if some high level players need to re buy it! Hopefully if it was done well enough it could become a challenge and prompt discussion on how to complete.