I was kinda wondering about that myself as well
It'd be nice that even if they were mostly in those WoE 2 dungeons if a few spawns outside the dungeons could be added in sensible areas (e.g Banshee Masters @ Abbey, Aunoe/Fanat/Beholder Masters in Rachel Sanctuary, etc.) much like many of the monsters in the current WoE dungeons have (low, sometimes timed) spawns outside of their respective dungeons.??Not everyone cares for WoE or has the time for it, so it'd be nice for those people so they don't have to rely on DBs to try for their drops/exp.
A special dungeon like Aaro mentioned might be nice too, but of course there'd be the problem in having a map (making one, or using something that's not used for anything else) for it...
But just my thoughts