You have been proven wrong over and over again in this thread. Just because you deny it doesn't mean that it didn't happen.
Almost everybody agrees there was no saving the Wii U. you haven't proven anything, Kinda just seems like you are delusional. Most agree japan vastly prefer's handhelds, just because you think something, doesn't mean it's proof. Can you explain why N64 sold respectable numbers in US, yet flopped in Europe? or why xbox one flopped in europe yet is selling good numbers in the USA, it's not all about software. Preferences, Brand and desirable hardware play a major role. you even bring a pathetic argument that system just launched starting selling 50-60k a month cause there wasn't no releases for a couple of months.
Yes, there was no saving the Wii U. Part of why is that its software pipeline was broken right out of the gate and the droughts started immediately after launch. Software sells hardware, so if there's no new software for an extended period of time, the hardware won't sell. That's why Wii U sales were so bad so quickly. Conversely, there were bumps to hardware sales when new software got released.
Yes, Japan prefers handheld consoles because they are more convenient and the only advantage that a home console can provide nowadays are better graphics which hardly anyone cares about. Still, if home console or handheld console was the only thing that mattered, the Vita should have sold better than the PS4. Since that didn't happen, the logical conclusion is that games are more important than the console itself. But since you keep being in denial that games matter, we get posts from you where you claim that the software droughts of the Wii U did no harm to its sales.
It's pretty easy to explain why the Nintendo 64 as well as the Xbox One sold respectable numbers in the USA, but not elsewhere. The rate of multiconsole ownership is historically much, much higher in the USA than anywhere else in the world, so international struggles of a console don't translate to the US-American market in the same way. The costs of electronics as well as disposable income allows US-Americans to buy more consoles as well as games than people of other countries. Indeed, it's not only that the average gamer in the USA buys more consoles, but also more games per console. The USA leads the world in tie ratios by a comfortable margin. An additional reason for the relative success of the Nintendo 64 and the Xbox One in the USA is software that appeals to the market. The Nintendo 64 heavily dominated the FPS genre in its generation, the Xbox brand in general has the image of the American console because of its software library.
The Wii U was such a colossal failure that Nintendo had to combine their handheld and home console departments just to beat the PS4.
It would make more sense to say that Nintendo reacted to Sony's decision to only support one console going forward. Sony announced in mid-2013 that all of their American and European studios were going to make PS4 games, so Sony's exit from the handheld market was already a done deal at that point. If Nintendo hadn't combined their home console and handheld efforts, they would have been the only console manufacturer to support two separate consoles simultaneously which is an obvious competitive disadvantage.