Just watching these races from the 90's where Prost/Senna and the rest of the GP guys raced indoors in karts - who would love to see this back??
You could have all the guys from F1 and get some guest stars from WRC (Ogier, Loab, etc), MotoGP (Rossi, Lorenzo, Marquez) and some Indy/WEC/DTM/WTCC guys.
I'd watch this more than the Race Of Champions? What you guys think, and who whould you like to see race?