Nintendo can ask for the same price (~$50-60) in the App Store. I will still happily pay them but in no way I'll ever buy their handheld hardware again only for the games.
People complained at Square Enix when they released games for 15-20$.
What makes you think people would pay 50-60 when then complained about a third of that?
Anyway, as pointed out.... much bigger market and yet only 4x the profit.
http://www.ijailbreak.com/news/why-you-wont-be-playing-nintendo-games-on-ios-android-anytime-soon/
As it was so elegantly put:
If I was to take responsibility for the company for just the next one or two years, and if I was not concerned about the long-term future of Nintendo at all, it might make sense for us to provide our important franchises for other platforms, and then we might be able to gain some short-term profit.
However, Im really responsible for the long-term future of Nintendo as well, so I would never think about providing our precious resources for other platforms at all.