On the Japanes Wii product page, the words "近日生産終了予定" sit next to the console, which means "manufacturing is scheduled to end soon."
Considering that Nintendo really needs Wii U sales and a recent update allows for Wii U GamePad use with Wii games, this is a smart move for Nintendo. Sure, they probably should have done this a little while ago, and we have no idea when "soon" is, but at least they're finally accepting that it's time to let the original Wii go.