I'm glad you liked the idea.

Coming up with all original content is a really tough thing to do for an indie, especially in the MMO scale. To give people an idea of how much it takes to "do it right" in a real commercial project take a look at Blizzard. Their company employee roster soared as soon as World of Warcraft came into the picture. It engulfed the entire company for years so that they could keep up and those folks were quite successful with their already 3 successful franchises (Warcraft, Diablo, Starcraft) and earlier titles which made them a company capable of starting such a thing of that scale.

So any tricks or concepts you can use to help augment that void of developer-created content, by all means pursue!

A good example are new user-generated content games like Little Big Planet(PS3), ModNation Racers(PS3) and Minecraft(PC). All of these games primarily provide a platform and resources for the players to generate their own content and so it takes away from the workload of the developers and with it allows the player a new and exciting aspect of play which is just as interesting.

I'm not saying turn you whole game around into a user-generated content game, but you can certainly use ideas from that genre and make them work towards helping the players create their own in-game activities such as quests, items, mini-games, actually users generating new areas to explore, etc...

Maybe you could unleash your map editor (if it's in a "user ready" state) to the public and let them design new areas or castles, dungeons, fortresses, villages and so on as a contest? PGD would definitely help spread the word to get more people interested in it.

Anyhow just a mini-rant to maybe give you some ideas to build other ideas upon.