I don't think the cost of implementing HD would be worth the return , regardless of cost I don't think the Wii userbase would embrace the HD option to a great extent.
If you look at the best sellers on the Wii , Wii Fit , Wii Play , Mario Kart etc are the kind of people who buy these games going to want HD version of them ? maybe a % of them but a very small percentage.
Wii HD doesn't make sense now , it won't make sense next gen or any other generation for that matter ( asusming Nintendo stays with their current demographic) HD is on relevant to the time it's in and HD this gen probably won't be considered HD next gen.







