The double screen has become a staple of Nintendo devices, it will come back. However, they should do something similar to the Dualshock 4: a traditional controller with a small area used to have a touchscreen. Imagime a controller similar to the GameCube or the Pro but with a touchscreen in the middle the size of the DS touschscreen. That would be enough for their needs. And if you want something bigger, you buy a gamepad separately.
Also, please don't streaming. I still don't trust that technology.










