To be fair, the Wii U was a mega-bomba compared to the GameCube. I'm not surprised that Nintendo's trying to save Smash 4 from the sinking ship known as the Wii U.They bust out gamecubes and CRT's for Melee, why would you think they'd have trouble getting WiiU's?
That said, I wouldn't be surprised if The Pokémon Company pushes for an NX port of Pokkén Tournament to keep the game alive for longer.