Well for DS games, you could play them with the two horizontal screens; left and right and using the controls or turn it sideways (top and bottom screens) and use a wireless JoyCon controller. For Wii games, you would have to use wireless JoyCon controllers that emulate the Wiimote and numbchuck controllers, obviously. If they don't add Wii VC games to the NS, then they're wasting their time adding them to the Wii U eShop, which is on a "soon to be" dead console. Wii U games will ported over, instead of emulated. As for 3DS games, they won't be available, at least not until a few years later when they discontinue the 3DS and then add them to the VC, like how the Wii U got DS games, once the DS was discontinued.