I think you've touched on some truth here.
But I think it's more about the Wii U's lack of what people want than what the 3DS has. I think people buy handhelds for very different reasons than home consoles. So I don't think people are walking into stores look at both and choosing a 3DS over Wii U. I think people are doing what I'm doing. Waiting for the Wii U to get the good stuff. I want a 3D Mario, full Zelda, Metroid Prime, and/or Mario Kart on the Wii U before I'm dropping serious cash on it. I have a 3DS XL and for it I have a 3D Mario, Zelda OoT and Mario Kart. That makes waiting even easier, but I assure you when the Wii U has what I want I'll jump on that train.
I waited for Halo 3 before getting an Xbox 360. I waited for Zelda SS before buying a Wii. I have more games than I can play right now so I will wait for the Wii U to get what I want.
