This is basically what I've come up with, whereby I think most everyone would relatively happy.
First off NX is indeed a replacement for all exiting Nintendo hardware (3DS, 2DS, Wii U, etc.). In the NX era, all Nintendo games run on all the following hardware, graphics/resolution simply scale up and down. Games come on DS-sized cartridges that can range from 2GB-64GB or via the eShop.
The chipset is the *key* to everything here, I will use a modified PowerVR GT7900 for this example, a new mobile chip. This tiny chip generates a whopping 800 GFLOPS at under 10 watts. It's perfect for microconsoles and its cheap. Low power consumption makes Nintendo engineers happy, but what about us? Well lets get to it:
NX Mario (Portable) - 600 GFLOP (downclocked GT7900), tablet-ish form factor with a few funky new ideas. Single screen touch panel. Has Nintendo OS, but can run Android apps pending Nintendo approval of said app so it has lots of extra functionality. 4GB LPDDR4 RAM w/32MB eDRAM. $249.99 launch price.
NX Luigi (Home Mini-Console) - Is basically the same chip as the portable above, but runs at a full 800 GFLOPS. 4GB RAM w/32MB eDRAM. Super small form factor, runs at sub-10 watts. Comes with a new funky controller that's still relatively cheap-ish. $169.99 budget priced.
NX Bowser (Full Size Home Console) - Is basically three GT7900s in one Wii U sized casing. So that gives you a whopping 2.4 TFLOPS of horsepower, being a decent upgrade on even the PS4 and double the XB1. 12GB of RAM + 96MB eDRAM (also 3x bump). Comes with both "funky controller" and standard pro controller. $299.99 launch MSRP.
For people who say this is too many variants, remember this is replacing *all* current Nintendo hardware. So bye bye Wii U, Wii, 3DS, 2DS, New 3DS XL, etc. etc. When you walk into the store you will see an NX section and Amiibo and that's all. If anything this is simpler for the consumer, they can just buy any NX game and play it how ever they see fit. Later on with a die shrink I think you could have a NX Toad (pocket handheld) that's the size of a current 3DS.
