And dude branding means nothing in this industry. Its about what have you done for me now which Nintendo failed at. The Wii petered off pretty hard and lack of support for its last 2 years didn't really expire confidence.
The Wii reached a saturation point and then declined like any normal product. Hell, the Wii's 2011 sales weren't that much different then the 360's 2012 sales. By that logic we should be saying no one will care about the 720/PS4 since the 360/PS3 sales were down in 2012.
Once again the Wii has sold 98 million consoles, with games like Mario Kart selling over 30 million. To say the majority of the audience is going to know longer care about the latest games in these series after selling so well last gen is just ridicules. This is the same logic people used to say smartphones have stolen the 3DS handheld audience when it first came out. But that was proven wrong when the system has sold over 30 million in less then 2 years and games like Mario 3D Land and Mario Kart 7 have already sold over 7 million in only a year on the market, with NSMB 2 being out for not even a year already on track to surpass even that.
People buy Nintendo systems for Nintendo games, which the official sales show, are still more popular then ever.