If the Wii did not -- or does not in the future -- maintain its commanding lead on the console market (Yes, I'm aware that the Xbox360 currently has more consoles sold, but it's clearly going to be eclipsed at the current rate), then I'd agree with you.
The problem is this: if the Wii has, let's say, a 2:1 console advantage (or more) over other consoles, and its developmental costs are half that as for other consoles (this is a much bigger deal than most gamers realize, simply because these costs are just big, abstract numbers to us), then most companies simply can't afford to ignore the system. I'm sure many people feel it is hard to make good games on the Wii, but if the profit margins are profoundly and noticably larger for good Wii games than for good (for example) Xbox360 games, we'll see a lot of people developing anyway.
Simply put: if you're staring at millions or even tens of millions of dollars more for a highly succesfull Wii game, CFOs aren't going to like the "but it's hard!" excuse for choosing to make PS3/Xbox games.
I totally agree with you it's possible that your scenario will happen: I'm just giving a counter argument. It's amazing how much creativity can come out when theres money to be made :p
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