Is it possible to reach the top level?

[Metroplex]

Seeing how near the end of the game there are simply NO enemies to fight anymore in all the areas of the game?
There should be at least some spawning enemies in all areas you have visited before just like in Titan Quest, a game that never run out of enemies and allowed to gain XP points.
Sorry if this topic has been raised before but I couldn't find it, maybe this can be fixed in a future update as this severely limits the playability of this fine game.