Your point has one big flaw. You can't put an app on the App Store that is, in itself, another app store. First, you can't install apps directly from another app on iOS (on Android you can, if the user manually sets the setting to allow doing so). Second, Apple refuses apps that sells goods that are being sold in any other app included on iOS (games, apps, music, etc).
On Google Play (and the App Store), you couldn't put an app and just allow people that have the Nintendo app to download it, since the only filtering option is by devices. What you could do, it to create a framework like PS Mobile and run the games inside it. The you could create what you are proposing. However, that still leaves you out of iOS since there the problem isn't just technical, but an App Store politic. PS Mobile wasn't available for iOS, most likely by this reason.
I also don't see how putting all your apps inside another one is good. Because you are basically removing them from Google Play and App Store, leaving them out of the search mechanism and from a SEO standpoint, that's just stupid (yes, PS Mobile on Android was stupid and that's why it's dead now). Downloading an app is simple like> open Google Play/App Store, search for it, download it. Adding an extra step will just get you less downloads. It's easier to just add a mandatory NNID login to the apps and a button to see other Nintendo apps there. However, making the guy create a NNID just to play a game also will drive people away. In the mobile market, people want instant gratification. You would be surprise at how easy it to turn an user down.
Despite how creating an accounting system that isn't tied to hardware and allowing cloud save, cross-buy and cross-save is good, you are assuming that these things will set the world on fire even if they are available on all competing platforms right now.
In the end, the image you posted just indicates that:
- They will have a separate handheld and home console system.
- They will have a Nintendo app and games for smartphones.
- They will have an unified account system that isn't tied to hardware.
- Probably a lot of cloud services.
Why isn't this a revolution? Because PSN and Live are doing this for years. If you get any combination of PS3/4/Vita, you already used all of the above.