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Frankly, 1 good Wii game is more fun than 5 of the best that its competitors can try for. As insane as it may seem for the RPG-obsessed box I am, I'd say that the Wii's non-RPG lineup of Super Mario Galaxy (Fantastic), Metroid Prime 3 (Orgasmic), and Super Smash Brothers Brawl (Cannot Help But Be Godly) overcomes even my urge to play RPGs. Besides which, I gotta say, the genre of RPGs seems to be very, very sluggish at the moment--not much seems to be on the way, and not much seems to be worked on right now. The only RPGs of note that I've heard about in the past year have been one of the four things:

1. The Legend of Zelda: Twilight Princess (which is Wii anyways, so I can confirm that it's great)
2. Mass Effect (Which is KILLING me that there's no PC port; I'm going to have to rent a 360 to play this at some point. There's no way I CAN'T play a game by the people behind the KotOR games)
3. KotOR3 or Fallout 3, which are certainly going to be on PC anyways so I'm safe
4. Being released for the PS2

Honestly, right now, for the RPG side of things, sitting idle with your PS2 seems like the safest bet. There's STILL RPGs coming out for it lately, and it seems to be the only console which companies are seriously developing the genre for. Until a clear RPG console is chosen, as the PS2 and PS1 were before, I say work on the RPGs that're available for consoles you already have (there's no way anyone's completely exhausted all the RPGs the PS2 and its PS1 compatibility have to offer) and get a Wii if you can afford to do a system now and a system later.

However, if you've gotta choose one, and the Wii's highly superior nature can't tempt you over RPG possibilities, I would say that the PS3, most unfortunately, will probably be the one to go with, simply because:

1. Sony has a history of being the unquestioned RPG machine-makers.
2. The Wii, while clearly the best system ever created, is very focused on games that take advantage of its innovative gameplay possibilities. And RPGs and gameplay really just don't have a history of mixing at all.
3. Nintendo also hasn't had a good history of RPGs since the SNES. More than likely the majority of the Wii's probably meager offerings will just be Zelda, Paper Mario, and Fire Emblem games. Which isn't bad, of course, just not very much.
4. Microsoft markets its machine where the money is, and the real money is in morons and casual gamers who throw tantrums if they can't press the Start button to skip anything remotely resembling plot. So while you're sure to get plenty of unoriginal and inferior Halo garbage, as well as plenty of unoriginal and inferior Halo Wannabe garbage, it's probably already had the best RPG it's going to get.
5. SquareEnix is retarded, so there is a good chance that it will focus all of its efforts on the worst system in general, and thus the PS3 is a shoe-in for its considerable quantity of RPGs.

So yeah. If you can stomach both the system's price and its creators repeatedly making statements to the press that insult your intelligence and make you roll your eyes at their arrogance and short-sightedness, then the PS3 is probably going to wind up once again being the biggest RPG system of the newest generation. That is, if any of them do at all; the interest in continuing PS2 games for the genre is strangely persistent so far.