I think the Wii's 'problem' when enticing SE's support was that it didn't really offer a specific market. What i mean is like, SE are either going to make a game focused at their core Japan market - where it makes more sense to develope it on the PSP / DS where costs are cheaper and userbase is bigger or SE are going to go for a global market with a big-budget HD game. I think they're just finding it hard to find any kind of formula that 'fits' in with what the Wii offers.
I think SE are still doing alot of things right there, they're getting far more out of the handheld market then any other third party and they seem to be refining their list of big-budget HD hitters to games that are for the most part successful. They are missing a trick with their Wii sales but I do understand their problem, as whenever I think what they could do with the Wii I normally then just think they'd make more with it just being a handheld game.
I think their challenge going forward now is adjusting to a few years with a smaller handheld market to draw from, afterall the 3DS looks alot more competitive on the software side of things and PSP2 is nowhere to be seen yet,
