Nintendo has always been about pumping out potential best-sellers first, filling the catalog with additional content later.
It's pure goodwill (or Miyamoto accidentally saying they're working on it) that led them to put out a game like Pikmin 3 in a new console's launch year after the first two games' performance on GameCube.
Nah, it's that they didn'tg et their shit together and release it on the Wii as otherwise the Wii U lineup would've been even more barren than it is now.