The Wii Shop Channel will shut down worldwide in 2019. This affects both the Wii Shop Channel on Wii, and the Wii Shop Channel accessible on Wii U using Wii Mode. It does not affect the Wii U eShop.
Customers will no longer be able to add Wii Points starting March 26, 2018 (8 pm UK time). Customers will no longer be able to purchase new titles starting January 31, 2019 (6 am UK time). Customers will still be able to re-download titles they have already purchased until later in 2019, when the Wii Shop Channel will shut down completely.