So you can earn XP forever to unlock every Epic Destiny completely.
Question is, where would the XP for this come from?
Are you guys planning to add a whole new layer of Epic Quests to DDO? MotU will be big, I'm sure, but could it possibly hold enough XP in itself to even get you to level 25, let alone max a number of Destinies? Even with every single already existing level 20 epics, XP is pretty finite, especially with the lack of epic wildernesses.