Since Wii U failed, what should Nintendo have done to follow up the Wii's success?

[Materia-Blade]

bunchanumbers said:

Oh I mean stuff like a new nunchuck with improved sensitivity and a speaker. A new speaker for the Wiimote and a rechargeable battery like the Pro controller. It should be able to hold a charge for 50+ hours including peripherals. Improve the button placement and you got a winner. Like I said the Pro controller would be for the mainstream stuff, but should always be a option. Stuff like this would have refined the Wii U into something else.

the evolved wii mote + nunchuck I have in mind is shaped like a pro controller but divides in two halves. so, it renders a pro controller useless.