Honestly I think everyone having their own personal handheld which acts as a console controller is the most logical step forward. Bring your controller to other people's houses and have it automatically sync in and you get points for playing with friends or something.
The controller itself being a widescreen but you can flip it sideways (portrait mode) to switch into double screen mode (e.g. to accommodate DS or 3DS virtual console) or use the TV plus full controller normally as top and bottom screens.
(The issue here is button placement so they just need to come up with a clever solution so that whether you're holding it normally (landscape) or sideways (portrait), you have access to relevant buttons. This could potentially be achieved with some sort of dynamic haptic feedback hotspots design, for example.)
The controller itself being a widescreen but you can flip it sideways (portrait mode) to switch into double screen mode (e.g. to accommodate DS or 3DS virtual console) or use the TV plus full controller normally as top and bottom screens.
(The issue here is button placement so they just need to come up with a clever solution so that whether you're holding it normally (landscape) or sideways (portrait), you have access to relevant buttons. This could potentially be achieved with some sort of dynamic haptic feedback hotspots design, for example.)