So you gladly ignore the Wii's rpgs because they don't have the same graphics as the Xbox 360 or the PS3. Right now here is how it goes in terms of number of jrpgs.
360>Wii>PS3
After TGS I expect at least 2-4 announcements for the wii. So I'm going to say.
Wii>360>PS3 That is only if the 360 or ps3 don't get any announced, but they probably will.
Now as for quality, I will say the PS3 and Wii are about equal with the 360 in the lead.(I would have said the wii was equal to the 360, but the 360 has FFXIII). This is my opinion though, and it isn't everybodies. Also my opinion could be easily changed. Now finally I am going to say that all consoles are viable platforms for Jrpgs, and if you own any console, it is a fine choice, and has a decent number of Jrpgs to come. Though handhelds are the true kings of rpgs, especially the ds, and I don't see this changing anytime soon. At the end I see the Wii with the most, but in terms of quality they will all be about equal. This is ignoring Wrpgs though.