Based on the response to Super Mario Run, Fire Emblem Heroes, and Pokemon Go, I'd say their customers clearly do want to play their games on a smartphone; they just haven't had the opportunity.

Now, if you'd said, "their customers don't mind buying Nintendo hardware to play their games on," that's much harder to deny.

Some customers want to play those games. They're not necessarily the same customers. It's not proof they could bring their entire customer base with them.

Those games are made for touch screens. Super Mario Run is proof that no one will ever crack the on-screen joystick problem - Nintendo knew they would not be able to make a good game that way. The end result is certainly fun, but can in no way compete with the experience of a traditional Mario game.

And people will not buy add on controllers for smart phones. Not even for Nintendo.

This reminds me of the arguments a decade ago that Apple should stop making hardware and just license OS X to PC manufacturers. We never would have had good trackpads or mic jacks that can use the clicker on iPhone headphones or all the other bits of integrated hardware and software on Macs.

Nintendo is much like Apple in that they design their hardware features to compliment the games they want to make.