In terms of the Japanese market, let's be realistic here, the 360 is flopping. It's selling less than the original Box at the same time in its life. Third-party support is better this time around, but apart from the two Mistwalker titles, I don't see too much that would make Japan pick a 360.
That leaves the PS3 and the Wii. Does every game need to look like FFXIII? Face it, most JRPGs aren't really shiny examples of graphical splendor. But the Wii has a stupid remote, how can you play games on it??? Why not? The feature is there, that doesn't make it mandatory, you still have your analog stick, you still have your digital keys, you still have buttons, not to mention retro-gamepads. Extra-wiimote functionality can be added in as an enhancement instead of requiring to be a driving force for every game. Tedious menu navigation? Point and click. You don't need to swing a sword in every game.
Not to mention that because 'Wii graphics sux lol', it's becoming the more attractive option for devs who aren't trying to make FFXIII. Namely, SNK and Megaman dude have pointed this out. I won't be surprised if the Wii ends up as the haven for 2D games. Or, niche titles that aren't expecting to sell millions (obscure JRPGs????) that can't afford to focus on making polygons.
What with diminishing returns of graphical awesomeness with each coming gen, I wouldn't be surprised if devs see the affordable console as a more attractive option. I'm not sure everyone who likes the PS2 as it is is buying into the 'more PS2 games, but with more storage space and a nice pricetag' when devs could be developing the same games (PS2-type games) for, say, the Wii. Not every DS game uses the mic/touch screen/dual screen (but, of course, the presence of these features can allow for more convenience, such as using two screens to track down data - or the Wiimote to navigate menus).
Of course, either the Wii or the PS3 could technically flop. I reckon many devs are still waiting to see how they fare before pledging loyalty or whatever crap. If the PS3 isn't selling, devs aren't going to diss out massive amounts of resources to make games for it. Same goes for Wii.
And I leave you with Sony PR quote of the day.