I feel like the next Nintendo (Fusion) portable will be quite powerful shifting away from the DS/Wii era design philosophies, without breaking the bank per se.
They will drop the second screen/3D screen elements of the 3DS to save money/costs and invest in a better quality single screen setup, but that will give them adequate budget to really go with a powerful mobile GPU/CPU I think that will scale down in cost quickly.
It will be powerful enough to handle Wii U ports, maybe even XB1/PS4 ports depending on the game (scaled down at a much lower resolution of course, maybe 960x540 at 30 fps).
I could see things like Kingdom Hearts III, maybe even Final Fantasy XV getting a Fusion release as such.
That Tegra K1 tablet is $299.99 today, by spring 2016 something like that will be pretty outdated.
Such a system should do very well in Japan, well in North America, and decent in Europe, but Nintendo needs to make sure it launches with an incredible launch lineup. Mario Galaxy 3 and the next Animal Crossing should be moved over to it, wasting them on Wii U is a losing cause.
If you could launch day 1 with Animal Crossing and then have Mario Galaxy 3 say two months post launch that would rectify the big problems with 3DS and Wii U launches had (post lanch lull).
