My guess is 2022 for the succesor.
Full retrocompatibility.
Some 2022 and 2023 Nintendo titles to be released for both consoles.
From 2024 onwards everything is for 2witch.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile