You may easily play SNES and NES games using Virtual Console games. And for those which aren't in the eShop, you could look for injected ones.That's the question... Does Homebrew allow you to play Wii, Gamecube, SNES and NES games on the gamepad with the TV off? Is there a way to do that?
All Wii games can be viewed on both Wii U pad and TV, but you have to use the wiimote for most the others you can play using gamepad. There's no black screen involved.