Really? Gimped version complains? REALLY?!
In case you have all forgotten, Versus XIII was in production for the PS3 for six years before it got booted to gen 8. It was originally intended to run on 512 MEGABYTES of memory.
If anything, a Wii U version might be technically superior because it has sufficient eDRAM to run 1080p and Cerny--you know, the PS4's designer--has admitted that eDRAM allows for better throughput than the PS4's unified RAM pool.
Even assuming Square Enix is incredibly lazy and doesn't use the eDRAM at all, I have a hard time imagining the "gimping" being visible. More notably, however, is that gamepad. Even very crude porting will make it a much better menu than on the other systems.
So yeah, FF XV on Wii U. Don't think it'll happen, but it's still a great idea.
Kingdom Hearts 3? Psh. The Wii U won't even sweat.