Source and Interview where it's from"Mmm… Putting aside the odds of it happening, I must admit I have a lot of affection for F-Zero GX. If the opportunity were to present itself, I wouldn't mind. And in that case, I'd like to make it a challenging game. I believe that if Nintendo just wants a racing game that is 'fun and accessible', they already have Mario Kart for that purpose."
Personally, I think a new F-ZERO game for the Switch makes more sense than Mario Kart 9. It could be a tech showcase for the hypothetical Switch Pro, who knows.