Any consoles without support will fail

Only if they do everything right. And I mean, EVERYTHING.

They did have a good idea when they tried combining their home consoles with their handheld consoles, if the NX can combine and cooperate with mobile platforms it could survive in Japan.

The price is the most important of all, whatever the reason is most people will not pay more than 200 Euro for a Nintendo console/handheld

I have to ask.  Do people seriously think the NX is going to an all in one console/handheld?

Because if you guys believe that, then wow.  Anyway, are people reading 'Nx' as 'N, X,' or as 'N cross'?  Based on how Iwata talks, it looks to be N cross.  Two seperate devices, which can interact with each other and share.  No idea what they'll share but I doubt it will be the same libraries.  The key for them though, is that they will be able to share development libraries(?) or make it easier to bring over assets.

That sharing could just extend to the handheld being the gamepad for Wii U backwards compatibility though, or they could extend that further, and go the PS4/Vita route and allow streaming of the console games while away on a busor something.

Heard they sell more adult diapers in Japan than baby diapers nowdays.
Consoles and handheld will continue to decline there, mobile will continue to grow.

The mobile market is still young. As developers move into that space and the market matures things will sort themselves out.

Mobile is king now and a new Nintendo handheld and/or console will not change that.

It will happen in the west as well.

Nintendo as a whole isn't doing too bad in Japan, when all is said and done, they will have sold roughly 25 million units of hardware in the region, which is right around what they have done every generation excluding Wii/DS.

Home console.

This thread isn't about home consoles so ur comment is irrelevant.