Ssup,
How about adding some variety to the Nightmare dungeons? I believe everyone is trying to avoid them after completing leveling their glyphs or boosting their alts.
Basically add a portal appearing randomly in 30+ tier leading players to another level of a dungeon with max power loot drop and a boss at the end with uber unique chance. Similar to Cow level or Whimsyshire - WE REQUIRE an easter egg level and a purpose for keeping doing NMDs.
What do you think?