It’s an end of an era as Nintendo has announced that the Wii Shopping Channel will close on January 31st 2019. You can add points until 2018/03/27 and will still be able to buy Wii Ware and Virtual Console games until 2019/01/31. This move also affects the backwards-compatible one on the Wii U.

Redownload of already bought software, as well as the Wii -> WiiU data transfer will stay online for the time being but will also shut down at an undetermined date in the future.

Source