This is like asking 'how will Halo or Titanfall make people buy Xbox One?', or 'how are Infamous and Uncharted 4 going to make people get a PS4?' They're system sellers, they're games a lot of people want and are willing to buy a system for. MK and Smash Bros. are definitely system sellers, just look at MK7 for the most recent example of this. Trying to deny that is trolling, honestly.
Those games aren't going to magically make Wii U into a Wii and make it sell 100 million units, but they'll definitely move a ton of systems, without a doubt. That goes for all system sellers across all consoles for that matter; not just MK and SB for Nintendo.
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