| If i was going to get a writer for a fantasy OR scifi mmo, i'd try to get David Weber.
one of his series - atleast the first book(mutineer's moon- you can read it for free on baen.com) i heard- is going to get animated for a miniseries.- it was going to be a full series, but the anime company that wanted to do it, wanted to change too much of the story for Mr. Weber to sign off on- he wants it to remain fairly true to the story.
the man writes decent/good fantasy and does VERY good Sci-Fi.(most of his sci-fi ends up on the NYT best seller's list)
another person i'd consider for a sci-fi type mmo would be john ringo. i don't think he has written much fantasy- though he does have one book series that is mostly fantasy, but it's a futuristic sci-fi type (science with body mods, shape shifters, elves, etc. it is a what happens if the "power" gets turned off type of story) | 