It's like asking, "What would have happened if Anakin died in the PodRace?" Well, Qui-Gon and Obi-Wan would have gotten off planet about five years later, and the Trade Federation wuld have taken over Naboo. Padme would have married some other guy, and Qui-Gon would not have died. Luke and Leia wouldn't have ever been born, the Republic would have most likely stood, and the Clone Wars would never have happened. All in all, (to answer your question and to answer what I just wrote), there would have been no story.