What you're saying can basically summarized with "the console makers need to stop trying to all go after the same audience", has nothing to do with Nintendo in particular.
Wii was successful because it gathered the casuals, the others weren't affected by the Wii because they had totally different audiences. And the 360 and PS3 could basically co exist the way they did because of Sonys blunders.
Now you have Nintendo going after the Nintendo core, which is also a mostly different audience then the PS4 and X1 audience, it's just way smaller then the casual audience of the Wii. PS4 and X1 are still going after the same audience, only this time the already weaker Xbox brand had all the blunders, while the PS4 had smooth sailing.
So believe it or not, the Xbox's and PS's sales have nothing to do with Nintendos success or lack thereof.







