I've been trying to fit this into a game for years, but never quite got around to it. I think I like the IDEA of the Mythic GME, but when it comes to making literary decisions in my game worlds, I simply want to control all of that myself. One thing I did really like is the "chaos meter", which I'm using a highly stripped down version of in my current game. It's a nice way to escalate events in a game along a reasonable curve.