Cancelling the Wii U version would make zero sense, and would seriously hurt Nintendo, even if the Wii U is a dead console.
Ofc this is Nintendo, so I should probably say that cancelling it is a great idea, so that my Nintendo conspiracy theory kicks in.
"Just for comparison Uncharted 4 was 20x bigger than Splatoon 2. This shows the huge difference between Sony's first-party games and Nintendo's first-party games."