73119
They really did go all out with GX, definitely one of the greatest racing games ever.
Amusement Vision did disband but the employees still work at Sega and they'd be willing to make another F-Zero game; they're just waiting for Nintendo to contact them...
Also just get Nintendont and the Homebrew Channel on your Wii/Wii U to play GX (since the price jumped from $15 to $40+ for it) you won't regret it.
I still have the disc ATM, but when it eventually dies I have homebrew ready

The problem is that Nintendo always wants to do something wonky, so unless they figure out a cool way to see the gamepad for F-zero, I don't think they'll desire another game =[
But yeah, they put so much into F-zero GX. Online play, some added content, maybe a stage builder, there honestly isn't much to add xD