The Wii will get most RPG's, I'm not sure if it'll be like the PS2 as the Japanese market has changed too much to handhelds, so although most console RPG's will be on the Wii the focus is always going to be on DS and PSP. We've not really seen how RPG's sell on the Wii yet either, but with third parties struggle to launch anything other then Dragon Quest or Final Fantasy on the system I can see the devs just sticking to the DS :/.
As for PS3? Well, it ain't getting no more exclusives, unless they're low budget stuff like Cross Blade. Saying that not all the RPG devs will be ignoring the PS360, it's going to have a big 'global' RPG market once Final Fantasy XIII hits both consoles and Versus hits PS3. You're not going to see the quantity hosted by the PS2 / DS / Wii, but as seems to be the way with all PS360 developement, it'll be a bigger focus on one big huge seller hit then lots and lots of RPG's.
I do hope the PS3 gets a few good RPG's every year, I own a Wii and DS so my RPG fix is there but I'm personally struggling to see either system give me an RPG experience my PS2 didn't (Even if the world ends with you was AMAZING).







