Imagine a shortcut to HBL, USB Loader and Nintendont straight from Wii U home screen and with Gamepad enabled for all of that... 'perfect world'That's the last pinnacle regarding backwards compatibility when it comes to Nintendo consoles.
We already got every other console covered with Retroarch in Wii U, excluding N64 and DS, but those might come later, so the only thing remaining would be Gamecube with Gamepad controls (and some Wii games which had the option to be played with CCP).