Idk was title bit misleading but I was thinking what will happen when devs decide to stop making new dungeons. I mean, every mmorpg game have their max level. As example many older mmorpg games have long time ago reached maximum level in game.

Only idea I can think of is some sort of "prestige" system from call of dutys, when you reset yourself to level 1 and level again to achieve some sort of reward or some other extras.

/discuss