Without World War II, what would France replace its 37 mm guns and 13.2 mm machine guns with once their weaknesses became clear?
Short answerProbably a later French-developed upgrade introduced through normal modernization, because the need would be less urgent and less publicly obvious without wartime experience.
NotesThe weakness of the existing light anti-aircraft battery might not become publicly undeniable without the Second World War. French planners would still accumulate evidence through trials and normal service experience. A later domestic weapon would probably appear through an ordinary modernization cycle, while combat experience would have compressed that timeline. The counterfactual changes urgency more clearly than it changes the eventual need for replacement.