I've never actually played another MMO outside of FFXI, so I can't really say my idea is like anything already been done. My idea stemmed from watching the new anime "Overlord" and thinking of his guild building, and that idea in FFXI about the build your own dungeon and let your friends fight in it for w/e reason.

Also, if anyone has another idea to add onto this one, I'm hoping if it garnishes enough attention, the Developers would take notice and implement something in the general direction. So feel free to voice your ideas and opinions!