You can have the same gamecube control adapter as the wii u which plugs into the dock via the usb ports. Then you have an hdmi connection to a low lag LCD screen. The only thing that would introduce lag would be the emulation. If there is little enough emulation lag than I think this could be the new standard for competitive melee.
Not only would this be great for melee but sales would also get a bump from the melee community.
Discussion started at here by ocrespo42