Our NNID has records of all the games we've played and you can check this by going to the miiverse community or your download activity. So couldn't we just delete all our content and settings on our Wii U including our NNID and then link the NNID to the NX?
Of course people who bought physical games would have to download a digital file of their game now. But how would Nintendo prevent people from giving their physical copy away to their friend who never had to buy the game themselves? Well if the latest patents are correct, the NX should have another GamePad controller and it could have an improved NFC reader that can scan the barcodes of physically bought Wii U games. So in order to run Wii U games that you didn't download, you would need to have the game box with you to scan it before it runs.
This may seem like a convoluted and imperfect way to handle backward compatibility since Nintendo may have to re-engineer all Wii U games digitally to run on the NX. But its better than having the NX absorbing old Power PC components of the Wii U which adds unnecessary expenses to the system. Plus Nintendo may want to re-engineer their Wii U games to run on NX anyway due to Wii U's low install base.
But what do you guys thinks? Will Nintendo use NNID to make backward compatibility work? Or will the NX be backward compatible in the first place?
