Anything Nintendo can work, however Nintendo doesn't it need it. They have F Zero and Mario Kart. I want to see something that isnt racing unlrss its those titles.
Also i would like to see the next Mario Kart game be a sequel to Double Dash or make a Smash Kart Racing game with using all there Smash characters instead of just Mario characters. That can work. But a solely Zelda, Starfox, Pikimin or whatever just wouldnt catch my interests.