Historically, had France struck when they had the chance (during the
Phoney War) Germany might have collapsed fairly quickly. On paper, France was the stronger power, and even after the events at Dunkirk the French scored major victories in the field. The problem was that
Édouard Daladier was determined that the war would never touch French soil. If Daladier had been more fatalistic and realized that he couldn't keep the oncoming war away from France, he could just try to win it quickly, France could have beaten Germany. Hitler often left Germany overextended and vulnerable. If Édouard Daladier had gone for the jugular early in the war, Hitler would have been brought down by his poor planning and arrogance.