On January 30, 2019, Nintendo plan to close the Wii Shop Channel, which has been available on Wii systems since December 2006.
Obviously, Nintendo's customers have shifted to Nintendo eShop on Nintendo Switch and Nintendo 3DS family systems, and the company plans to focus their efforts in those areas. As such, the Wii Shop Channel will close in 2019 after over twelve years of operation.
Please note that content downloaded on the Wii Shop Channel can be transferred to a Wii U system using the Wii System Transfer Tool.
You can still add Wii Points until March 26, 2018, and purchase content on the Wii Shop Channel until January 30, 2019. In the future, Nintendo will be closing all services related to the Wii Shop Channel, including redownloading purchased WiiWare, Virtual Console titles, and Wii Channel, as well as Wii System Transfer Tool, which transfers data from Wii to the Wii U system.
If you have Wii Points to spend, content you want to re-download, or content you'd like to transfer from a Wii system to a Wii U system, you'd better do so while the services are still available.