Originally Posted by
iindigo
That's true, but if you think about it, an industry-changing game doesn't have to be ALL new ideas. All it needs is a few really great ideas and killer reimaginations of older ideas. Blizzard nailed this with WoW, mixing in just the right amount of new concepts in with strong implementations of the older ones.
So perhaps what's most difficult is figuring out which of these ideas are the great ones and then producing a well-oiled implementation of them.
EDIT:
I can't speak for anybody else, but my ideas all relate to how things work in-game rather than the medium through which the game is experienced. There's a lot of room in this area, seeing as there are a lot of potentially fun things that no MMORPG to date has even touched.