The remilitarisation of the Rhineland was the easiest provocation and was likely a bluff by Hitler anyway. France could have smashed Germany that year. In terms of their willingness to do so, they were so afraid of war and saw Versailles as unjust anyway so they were going to let it slide. The Sudetenland crisis though was an inexcusable moral failure and would have led to a significantly better outcome. France itself could have survived up until the middle of May 1940 with slightly more luck or better strategy though.
French surrender in WWII was very much a strategic choice. The hit to morale after losing Paris would have been extreme. However, if they could overcome that, it's conceivable that with the help of Britain, they could have stabilized a front in the rural middle of the country for the duration of the war.
