I've kinda read that, just the basics. It sounds kinda cool. However, for a 200th episode, I thought it was just ok.
But I admit I don't know how I'd write a "200th episode" in a way that many people, especially little kids, would enjoy. I'd probably take the Mane 6 and put them in an adventure discovering new worlds, new towns and new creatures, kinda like the MLP film.
Because of that, I'm not too harsh on the episode.