Self referential MMORPG concept

With so many wannabe MMORPG designers in the blogosphere, would it be possible to build an MMORPG whose concept is not hack-n-slash dragons+wizards, not space opera, not sekrit squirrel spies ... but instead an MMORPG design environment.

Classes would include Graphic Designer, Model Maker, Quest Writer, and so on.

Hmmm ... and bosses would be, of course, bosses.