And ...? Why would Nintendo want rewritable cards for retail game releases anyway? 

Where did I say that? I was mentioning why cart costs don't have to be a negative factor. I even implied that rewritable cards are unnecessary.  

In terms of power, as long as Nintendo gets the lowest common denominator in the right ball park (handheld), games could be scaled up/down properly.

Lets say 3 gpus is unrealistic, 2 can happen and there already are 1 tf mobile chips out (tegra x1) so if Nintendo really wants they can exceed Xbox One and possibly PS4 as early as next yr under a dual gpu setup. Simpler even, get the desktop relative of the mobile chip (Cobretti brought up a good point earlier about floating point), and it will still be low power for Ninty's liking.

To make it clear, Nintendo can release a low power consuming, affordable, true 1080p machine easily by next yr. Again the key is to make the HH powerful enough...

960x540 w/little to no AA + low lighting/shadows/textures (Mario handheld)

Vs.

1080P w/AA + high lighting/shadows/textures (Bowser console)

I'd say scales pretty well to a 1:3 or 1:4 ratio. 

I personally would like the NX to be like this. Not sure about the pricing but having a device for everyone in a sort of way seems awesome. I would love to get the NX Bowser.

Maybe this would allow Nintendo to get a lot more third party support. I would love a machine where I could play Mario, Zelda, Metroid, and many third party games without having any terrible setbacks.

What if NX works like a regular console and Nintendo's next handheld can be used as an add on to use as a controller with second screen advantages like the Wii U? Third parties won't have to deal with the whole two screens thing, and Nintendo can choose to support those features with their own content?

Buy the Zelda game for NX and play it with a normal controller (or Wii U gamepad if it supports it?) or you can also have dual screen features if you use the new handheld. Buy whatever Zelda game for the new handheld, and it adds more features and new ways to play with your home console experience. One feature could be associated with street pass or getting new perks from playing outside, and the other could just from having both games.

I think this idea could keep Nintendo continuing to innovate, while avoiding issues with third parties porting games, and potential buyers feeling turned off from being forced into playing with gimmicks they want nothing to do with.

Another post by someone who clearly has never developed a console video game in their life, much less a third party.

I have. This will never ever ever fly. Ever.

For every different new specification you are increasing the cost of developing for that platform dramatically. Developer kits would be astromnically expensive. Testing would be insanely expensive, the unique control set up of every console would drive up costs as well, and I'm not even getting into how ridicious the notion is of "scaling" as if it's aribtrary or not incredibly tedious, time consuming and expensive. You can't "just scale" platform-specific optimizations. It's not the same as PCs.

It's not that easy. It's not that simple. Third Parties would never ever ever support it for all the reasons above and dozens more. Let this ridiculous idea go.

Why isn't it the same as PC? If anything PC is far more complex, there are many, many different variations. A PC can have an Nvidia GPU. Which is completely different from an AMD GPU. It can have an Intel CPU or a different kind of CPU. And there are about 20 different AMD GPUs and 20 different Nvidia GPUs. It can completely different amounts of main RAM and video RAM. 

On top of that developers not only make games for PC, but also have to make games for the XBox One and PS4 which have different GPUs and completely different memory architectures. And many developers are still also developing the same version of games for XBox 360 and PS3, lol which are a full generation removed and two completely different architectures on top of that. MGSV is for the PS3/360/PS4/XB1 and PC (meaning Nvidia and AMD GPUs). 

This Nintendo setup is really only two seperate models (the Mario and Luigi NX models are basically the same, hence the brother moniker) using the same CPU/GPU family, same type of RAM, same memory architecture, etc. etc. 

Not every game needs to be completely reworked either, if a developer is making say a Kirby game, it's not like they need to go overboard with the graphics. They can make the core game for the base model (Mario/Luigi NX) and then simply scale the game up to 1080P with 4X AA for the Bowser NX model. 

Not every DS game plays like MKDS. It's luducris to pretend that one screen is sufficient to play dual screen games just because one game that didn't use the second screen much is playable. One screen isn't sufficient. Dual screens offer a superior experience, even without BC. I'd rather a shorter battery life than a regression in hardware.

And it's definitely not "outdated to kids." I worked at a summer camp last year with 1st graders. Two screens were plenty relevant to the the dozens of little 3DS owners. Even if none of them knew who Charizard was.

As some one who travels a lot for work, I'd say the ratio I see of kids using iPads/their parents smartphone for gaming outnumbers the 3DS by 10 to 1. Easily. This isn't even a contest anymore. The 3DS this year will have the lowest Nintendo handheld shipment in almost 20 years. They have not had sales this low since before Pokemon was invented. 

People who think "everything is hunky dory" haven't actually looked at the cold sales data. Nintendo has. That's why they are making smartphone games. 3DS is not getting it done. 

I don't think there's anything superior about a dual screen. The human eye can only fixate on one screen at a time most times. That means the second screen is almost always a map/inventory screen, which is eating up half the system's battery for something you look at maybe 10% of your play time. I'd rather have one single screen, especially as the graphics in the next handheld are going to be much better. Let the artists who work hard show off their work on a bigger canvas.