Is there interest in a pre-World War II game? The only problem I see is that someone would have to play the anti-semitism of the Third Reich.
Biggest problem I see with a WWII game is keeping hindsight out of things. French and British players, for example, would either have to be railroaded into appeasement or would inevitably take aggressive but highly unpopular action against a Germany who would flat out be unable to resist militarily. Keeping the game from ending early would require the GM to walk a difficult tightrope.
On a side note, how would a game for that era deal with how the French political system of the time changed governments on average every 10 months? Have someone play “France” and not a politician? Just ignore it?