Nintendo US never put much value on the franchise. I don't think it would have mattered if mother 3 had come out two years earlier.
Because Nintendo doesn't want our money.
I mean it's simple do the following: Metroid Wii u, StarFox Wii U, F-Zero Wii U, Earthbound 2/Mother 4, more 3dsxl color/themes.
Buy MegaMan franchise from Capcom, reissue Xenoblade Chronicles, Super Mario Time Traveling Game (3d platformer like Galaxy, Sunshine, 64)
Donkey Kong Wii U, Mario Kart Wii U that let's a player win based on skill rather than luck (like Super Mario Kart), sequel to Metroid Fusion, get the team that made Banjo Kazooie and Conker, and give them jobs, and finish up all the Zelda games planned.