Yeah, right now the Wii is struggling when it comes to RPG's. Chocobo's Dungeon is, from what I hear, a pretty fun game. Other than that I hear Dokapon Kingdom is a great game as well, although it's not much of an RPG in the traditional sense.
On the other hand, while Fire Emblem: Radiant Dawn is more of a strategy game, I would still recommend it to anyone looking for a challenging, deep, and very enjoyable experience.
So yeah, I hate to be that guy, but for now we're still playing the waiting game. Well, until Dawn of the New World comes out. And after that, it's looking like the floodgates will be opening in 2009.