Considering the install base, I can see the Wii getting a lot more attention from developers, although some still shy away from it because of the power of the HD consoles when compared to it.
Anyways, I don't see Agito outselling the console version of FFXIII, when using past FF games as a basis for both the consoles and handhelds. Of course, the releases of RE5 and Yakuza 3 has shown that the PS3/360 can push some very nice software numbers when taking the small install base in Japan.