I don't think it's intended to be a handheld. At that screensize plus a few inches for the controls on each side it's not going to be something anyone is carrying with them or playing on the go.
Anyone expecting a 3DS successor is going to be disappointed.
It's a home portable. More something you play lounging around in bed, or can easily carry from room to room to be used anywhere. Or carried to someone house. Not for regular use on the go, it's completely impractical for that. I'd say it's better thought of as an ultra portable console with an integrated screen, not a handheld gaming device for play anywhere anytime.
I haven't been following the topic much lately so I'm not sure what this is about. Are you talking about your dream console/handheld or are you saying you think this is what Nintendo will do with NX?
If Nintendo wanted to do another "home portable" type of console like you described they'd release another Wii U. NX won't be that though.