Two-time world champion Fernando Alonso believes Formula One will die out if the top teams go ahead with their threat to quit the sport because of the controversial budget cap.
The FIA wants to introduce a $100 million budget cap next season to encourage more entrants. Those that accept the cap will be given more technical freedom.
But the likes of Ferrari, who's current budget is seven times that, along with Renault, Toyota and Red Bull, believe it will form a two-tier competition and are threatening to withdraw if it isn't changed.
Speaking ahead of this weekend's Monaco Grand Prix, Alonso says he fears for the future of the sport.
The official deadline for entries into the 2010 world championship is next Friday.