Its usually best to read through a thread before posting in it, or at least the first few posts. As you can see by the very first post in this thread, its in reference to Hearts of Iron 2, a WW2 Grand Strategy game.

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Sorry, but I was under impression that the topic had been broadened into a real historical "whit-if" question...

No France could have never survived. Maybe lasted a bit longer if the Belgian forces lived to fight another day with the BEF and the French army. That would have given them an extra couple divisons. If the maginot line had extended the entire eastern border of France that wuld have helped quite a bit. With these factors I say France could have lasted maybe 1 or 2 more months...