I don't believe the wii will ever have as many JRPGs as PS/PS2/SNES had, nor do I believe that devs will start making huge Rpg franchises exclusive to wii because of the western market..
The PS3/360 combined have a larger install base than the wii, so they make there JRPGs for both platforms. Final fantasy XIII, Final Fantasy Versus XIII, Star ocean the last hope, Nier, Last Remnant, Final Fantasy XIV all have/are releasing on the Playstation 3/Xbox 360 and those are some pretty huge RPG..
on the contrary, Dragon quest X is coming to Wii.
But as it looks right now, I think the PS3 is getting more JRPG support than wii in japan, even if you exclusve square enix.








