If they were so desperate about this screen on the controller thingy, wonder why they didn't just make a 3ds v2.0? A little bigger screen and a decoder chip to receive stream from the main console, double the vertical resolution for "Wii U" mode, and they would end up with a much more potent hardware. (and still portable too)
I understand that they would need to sell it separately or much more expensive if bundled, but I'm afraid that most of the ported third party games will play better with a pro controller anyway, so "user must have Upad" games will become minority as time goes by, or devs will put there things like inventory or maps, which can be accessed with one button on other systems or while playing with the pro controller.