Too early to tell, we know very little of what will happen. Ask again in about a year and I might have a proper answer, but this is too soon, in my opinion.

Nintendo is a wild card. You never know what they're planning or when they're planning it for. As Jon Tron would put it, if there is a Nintendo Hadouken, there's NO dodging it. Simply, NO dodging it. It's gonna hit and it'll hit quite hard.

They pretty much cant do any worse console-wise so im gonna go with yeah.

Less, unless they pull out another Wii revolution or something. Their games have been great, but now that phone games can run better than a WiiU they really have giant competition. Do gamers really need another version of the same game? Sure, but they aren't going to pay the same price as Halo, COD or Destiny.

And they don't need a dedicated console to run it.

This is an interesting question.

In terms of consoles, I can't see them doing worse than the Wii U. It literally did everything wrong (except game quality). It can only go up from here.

In terms of handhelds, they have to do something to distinguish it as a really new thing to prevent a decline. As much as I love the 3DS, to the average consumer, it doesn't look much different than the DS. I think they need a new look and brand. Otherwise, we might see another drop. (Hopefully they price this one better at launch)

If it's a fusion (as in my idea of it being a console with a controller that can be used as a handheld, purchased together) then I definitely think that will sell more than 3DS+Wii U. (The marketing has to improve though. Seriously.)

Unless they have a gimmick that can drive sales like the Wiimote did ... I think they will continue to suffer hardware declines. Their upper management is simply too far out of touch with the modern gamer to be able to seriously mount an offensive without a miracle product to carry them.

Unifying the platform structure will help them, but it's not a silver bullet that solves every (or even the major) problem. "I want to buy a Nintendo console but there's not enough Nintendo games" is not really the chief complaint people not buying Nintendo hardware have. 

But they are going to make so much money from smartphone games that eventually they won't care. Next-gen will be more profitable for them, but almost entirely due to iOS/Android. 

I don't know. 3DS+WiiU now is around 60m, and I don't think they will make more than 85m after this gen ends. I can see the home console being more succesfull if they don't make any mistakes and solve their software output (they have to avoid droughts like a plague, buy more studios and bring 3rd party back), but the handheld will be tricky. If they make the Fusion system, they may sell 50-60m only but compensate a lot with the software, but that will depend of how would they implement it.

Oh ok. My bad

Console yes
Handheld no

Sure... if we will count there mobile success with their next generation. I mean as it looks mobile stuff will release end of this year and their NX should launch by the end of next year. I mean unless they want to show new hardware and then not release it for well over a year like they did last time -_-