I love F-Zero and dumped a lot of time into it when I was 13 but F-Zero GX was so insanely inaccessible to new players. None of my friends ever wanted to play split-screen because it required intimate knowledge of the controls, tracks, and machines in addition to crackerjack timing on the controller. Mario Kart is a lot more successful because it's the exact opposite. Although I'd love another F-Zero game I understand why they aren't bothering.