Britain and France continue facing down the Germans on the French border until June of 1940; the only actual conflict that occurs is between the airforces of each power. Great Britain and France can not muster enough will power to fight Germany and recognize the new state of affairs in Eastern Europe.
---or----
Germany gets a favorable settlement after knocking the stuffing out of France and grabbing the channel ports + BEF. The British recognize German gains in Poland plus the return of Alsace Loraine in exchange for which the Germans immediately pull out of Holland, Belgium, Denmark and Norway. The Germans turn their attention to the Soviet Union...
How plausible do you think either scenario would be?
---or----
Germany gets a favorable settlement after knocking the stuffing out of France and grabbing the channel ports + BEF. The British recognize German gains in Poland plus the return of Alsace Loraine in exchange for which the Germans immediately pull out of Holland, Belgium, Denmark and Norway. The Germans turn their attention to the Soviet Union...
How plausible do you think either scenario would be?