Nintendo of America’s Reggie Fils-Aime, in a Q&A with Recode:

The fact of the matter is this: We know that our consumers are walking around with a smart device, with access to the Internet on other devices. And we’ve recognized that in a variety of different ways. Our website has a responsive design; we just launched an initiative where through your smartphone or tablet you can buy games and push them right to your device. We’re looking to take advantage of all of those connected consumers. And we’re going to continue to do a variety of experiments, but at the core we believe that, for example, playing Mario Kart — that the Mario Kart experience they get on Wii U or the Mario Kart experience they get on their 3DS is something that, at least today, we don’t see that we can deliver on a Web-enabled smart device. It’s a different type of game.

This sounds exactly like what Valve is doing with Steam and their mobile apps. It also sound pretty reasonable.