Hitler would probably have been able to defeat the French armies. They'd just be overwhelmed by the tanks spearheading the attacks, and with the very much motivated, well-trained, well-supplied, well-armed and co-ordinated German troops who would have had a plan of attack, the Germans probably didn't even need to bypass the Maginot Line to get into France. Anyway, the French probably wouldn't have fared well in Germany seeing how quickly and easily they fell to Germany. Britain and France alone wouldn't be able to hold out against Germany... remember that this Germany was able to simeltaneously fight Soviet Russia, Great Britain and America while retaining their position in Europe (the Americans were practically at war in the Atlantic).