I was just thinking that the concept is sound from a business standpoint, especially for Nintendo, whose handhelds sell better than their home consoles. Make the console a handheld.
I was thinking about how Nintendo has given the Wii U the ability to connect to the 3DS to play Smash Bros., which is just ridiculous to me because you still have to own Smash 3DS. This would be so much easier if everyone's handheld also functioned as a controller because then you would have a reason to carry it around to your friend's house. There's great ideas like Streetpass and Mii Plaza that unfortunately only work on 3DS, but imagine if you could take that data to your home console as well.
Both the Wii U and 3DS have good ideas but combining them, in my opinion, would be the best case scenario for Nintendo. If they put all the processing power on the handheld side and simply make the iHome, or uHome, a disk drive/streaming hub, they could still market it as a substantial addition and profit off of it being a much simpler device. If you consider MicroSD support that the New 3DS is finally taking advantage of, the uHome could even act as a hub for the titles you don't want to be lugging around on the handheld all the time, freeing up space for downloads on the go or just for the the games you're playing at the time.
Jeez, now I'm just setting myself up for disappointment if they don't make something like this.