Notice I didn't say hardware. Im talking about home consoles. 3DS is not a home console. It's been clear for a long time that Nintendo's success in the handheld market doesn't translate over to home consoles because it's an entirely different audience. And their handheld business is in a pretty clear decline as well. They need to be worried that the 3DS successor isn't the handheld version of the GameCube or Wii U.
IIRC, sorine believes that the contraction of the dedicated handheld market caused by iOS/Android was a past event and not an ongoing trend. Suffice it to say that I don't agree at all.