Opinion: As earlier NX releases, as bigger are the chances it wont be what your waiting for.

[Soundwave]

I think what's false about this POV is assuming Nintendo has a choice here ... they don't have a choice really which kind of makes it an easy decision.

Nintendo does not have the capability to support a high end portable and even a Wii U level console with distinct software libraries.

The 3DS successor will take graphics at least to Vita++ level but probably more like closer to PS3/360/Wii U ... in which case, Nintendo really has no choice but to unify their portable/console lines. They cannot support what is effectively two high-resources consoles (basically) at once. 

So the truth is Wii U was always going to be a goner by the time the 3DS successor had to launch as the 3DS successor will force Nintendo into unifying their console line with their portable line (hello NX). Unification is the only way they can continue to have a portable and console at the same time going forward.

And 3DS successor is due soon, 3DS will turn 5 years old in just a couple of weeks from today, and it's done nothing to warrant a 6+ year life cycle like the original DS got (that sold a whopping 150 million so it was warranted, 3DS may not even sell half that).

Once Nintendo upgrades from 3DS to the next-gen portable, Nintendo will be forever changed.