Third Party Devs have made up their minds about the Wii.

[LordTheNightKnight]

"No NOBODY here knows it but some of you automatically assume that its the because of HD gaming DESPITE the fact all developers invest even more into the HD market ?
Do you know how their internal calculations are ? Maybe a big chunk of this costs were for education of employees or investing in new Hardware for 3d development natal development or what ever."

Investment doesn't automatically lead to losses. Nintendo is making an entirely new R&D facility. That's an investment they won't see any money from for quite a while. But they made sure they had the means to make that investment with minimal effect to their bottom line.

Many third parties are not doing that. They were focused primarily on HD games and trying to use the Wii's mythical casual market (mythical in the sense they believed those people bought games because they were casual). And this was before NATAL was even announced, when they were still losing money.

Now the HD projects could still have worked, but many companies still mismanaged them and let the costs get out of control. Those that weren't mismanaged instead spent loads of time and money to make the games just to the point they wanted, and the sales weren't any higher than the last gen.