France had 150 divisions on the border? Where the heck did you get that from? On September 1, 1939 France had a dozen divisions in the vicinity of their border from the North Sea to Switzerland.
They actually attacked Germany first and seized some territory in the Saar region.
By the time of the German assault in May, 1940 the French Army had around 90 divisions activated but how well trained and equipted they were is a good question.
Too bad that Maginot died in the thirties. France might have been better prepared for war and his defensive line maybe would not have stayed half finished.
it would have not been a factor regardless of its state of completion. the Germans came through the Ardennes.