lol, with all you have written, it looks like devs would need a whole new degree just to develop for the wii. You have to ask yourself if its more worthwhile for them to keep thinking up new bright ideas (to avoid releasing "more of the same") for this "expanded" audience every single time when they also have the option of scoring with a runaway hit like Modern Warfare and rereleasing an updated version every 2 years on PS360.
One of the reasons devs can afford to ignore the wii is that 50% of the market is pretty much figured out (PS360 users). It's just natural to do things you are familiar with as this grants the highest chance of success. Isn't it odd that games like Ar Tonelico III which can obviously be done on wii are ps3 exclusive especially when wii has more than double ps3 sales in JP? It doesn't have high end graphics which seems to be one of the main excuses for why people think devs stick to ps360 (the idea that the uncreative games can just be disguised by graphics). I'll need some serious convincing to believe sony moneyhatted that one.
To cut the long story short, the criteria for wii success is just too damn complicated. When you have to consider so much before developing one game, doesn't dev time/money end up increasing thereby killing off one of the strongest reasons for developing for the wii?
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler