I can't see the added value of online in a game like Super Mario 3D World. If you really don't have friends that live close by I suggest you make some.
I can see no fun in playing a game like Super Mario 3D World with strangers in a different room.
Let's keep the online and voice chat for games like Mario Kart 8 and Super Smash Bros 4. I really can't see any other Nintendo game that would be fun if it had online multiplayer. Zelda and Metroid are singleplayer experiences.
Maybe if they made a Luigi's Mansion for the Wii U and put in some (online) assymetrical multiplayer that uses the gamepad in a creative way. I guess the same can be said about Metroid, as long as it doesn't bring down the quality of the singleplayer.







