What complexity difference is there betweem Mario Kart 7 and 8? 

Or NSMB2 and NSMBU?

Or Smash Brothers 3DS vs. Smash Brothers U? 

Handhelds have changed a lot, they're no longer the "kid brother" of the home console, nowadays you can make any game on handheld, and many games like Xenoblade, Zelda: Majora's Mask, Final Fantasy XII, etc. that were never meant to be portable games work just fine on portable. 

It isn't the 1990s anymore where this was a console game:

And this was a standard handheld game:

Nowadays, that gap has closed, handhelds will now be able to run graphics like this ...

Unifying the product lines and sharing software between just makes sense for Nintendo. Why have something like Splatoon stuck rotting on a tiny Wii U userbase, when you could open it up to the 80% of other people who choose to buy Nintendo hardware, but just don't want the console? 

Dude... Stop editing in things like that

I want it like the way it has been because I want different experiences... Not the same experience on both the handheld and on the console... There are things that the console can do but the handheld can't like having local multiplayer, like having better graphics and a few more things. I don't want handheld graphics being upscaled on my 1080p and soon to be 4k TV... That would look awful... And I want a console that would look significantly better than the wiiU if they want to make me buy another one and of course, having the same games on both is a horrible business decision since it will butcher the sales of the console from a business prespective. It is a lose lose sitution because I as a consumer wont have better graphics, bigger worlds and etc on the console and it will look disgusting on my TV as well as features such as local play and Nintendo cause they will basically kill their console business by doing so which will have a loss in revenue cause people sure won't be paying $60 for a handheld game.

And yes, it is expensive to pay for both but you get seperate experiences that take advantage of the blah platform hence why you are paying for both if you choose too...

Yet you have both 3DS fans and Wii U fans upset that they're not getting enough games, now you want (let me guess) an even higher end console next time from Nintendo and an even higher end portable ... where are these games going to come from?

Mobile graphics are pretty damn good these days too by the way ... this is what the Tegra X1 mobile chip can do:

Why not just take 2-3 chips of that caliber put that into a console, and have 1 in the handheld? The games will look great even on a 1080P set. 

The segration of games needs to stop, and IMO there is no real "uniqueness" between the two platforms anyway ... hell the Wii U even tries to be basically like a handheld ... that you just play at home. Plus functionally most of their franchises now basically play the same on handheld vs. portable and that gap will shrink even further next time out as handheld tech approaches and even surpasses PS3/360 fidelity. 

"There are things that the console can do but the handheld can't like having local multiplayer, like having better graphics and a few more things"

The console will still have local multiplayer and better graphics so those are non-issues. Can u list these "few more things"?

And hence why the unified OS will help with the game development.. The issue now is that the 3ds/wiiU has two different OS's with two different sets of code where as the Fusion will have the same common code which will speedup development time...

And if you do that, then Nintendo is losing money because they would have to optomize it so that it actually does run the game at 1080p Natively... Also that demo doesn't actually look all that great when you have seen some ps4/x1 games and that demo of crysis 3 lacks tons of graphical features that are avaliable in the PC version. And not to mention that running a game at native res isn't the only difference between the handheld and console versions of the games... There are tons of other things that are better like better lighting, better draw distance, more things on screen and etc which won't happen either because it will be the same game on both platforms... And if the console version does have those things, then Nintendo will be losing money because they are giving it away for free if you purchase one

And the uniqueness is in the graphics and some aspects of the gameplay such as local as well as a larger world with better Ai and loads of other things... The difference in a dedicated console vs handheld is very noticable and I sure don't want that to stop because I want a next generation experience from Nintendo... Not another current gen experience or else why bother even buying another console?

How will the console have local multiplayer and better graphics if it is the same game? And if the graphics are just upscaled... That is hardly what anyone would consider to be "better graphics" unless you are saying that the console will have better lighting and etc but then Nintendo would be losing money because they would have to optomize each game in order to take that advantage so if they are giving out two games for free... That is a business disaster...

Not all of them, if Nintendo drops the Wii U next year I will not be purchasing their next console at launch if at all.  If I do buy it I will purchase used and only after they have a handfull of killer games (metroid(s) / zelda(s))

I'm not understanding how the game wouldn't have local multiplayer, u put the game in the console, hook up a few controllers and viola u play the game with other people......

Wouldn't it essentially be like PC games which allow multiple graphic settings? Do PC devs lose money by doing this?

Aaaaaaaaaand they've just been discontinued, for the crowd-pleasing "Nintendoorstop!"

How hard can you slam the door in frustration, before you both become unhinged, due to a lack of support!?

Local Multiplayer = having the console render the game multiple times as well as rendering loads more assets... Why do u think that when you have Mario Kart 8 in 3-4 players for example, the game runs at 30 fps? Or Hyrule Warriors drops below 20fps when playing local Coop? And etc

The luxuary of PC games is that PCs can bruteforce it so the developers don't have to spend much time optomizing it cause PCs have a wide range of hardware while consoles have only a single hardware that will never get improved until the next generation so games on consoles need to be optomized so consoles can't really bruteforce it...

Edit: Oh and PC devs do lose money... But they gain it back from the sales... Where as if you get both games for the price of one, Nintendo won't be gaining that money back because the console version will be free...