I think there'd have been a small increase in sales. I mean my sister thought it was Wii University, and thought it was just another Wii.
But they needed more games, and actual other controllers so we're not stuck using WiiMotes and Classic Controllers still.
Honestly it's not a bad system. It just doesn't have that many games for it. I ended up getting one for my daughter, and she liked it for what it was. (Mostly a Mario Kart and Mario Maker machine.)
Growing up, I wish some teacher told me "You probably won't ever need this, but if you don't learn it, you might miss out on something really cool."