I think trestres is being over-the-top on purpose. There's no reason to think that the Wii will dip below 10K/week in Japan for the next couple years, at the least, and JRPGs are big in Japan -- they will drive some hardware.
The PS2 is still widely supported, in the local-to-Japan JRPG sense, which is probably the major reason the Wii's sales have slowed down. It doesn't have the value to make it a worthwhile purchase to the legions of JRPG, Yakuza, RE, etc. fans... yet. The PS3 is riding the wave of a lot of cool Japanese-centric titles, like Y3 and Biohazard/RE 5, and will sustain itself with a number of cool new JRPGs this year, but the Wii will also get a shot in the arm.
That being said, the moment SO4 is announced as coming to the PS3, the X360 is dead in Japan, unless MS does something about, and fast.
