Would this shorter war help or hinder the cause of women's suffrage?
Short answerIt probably would not stop suffrage, but it might delay it because the war-work argument and the servicemen's franchise crisis would be much weaker.
NotesA short war would probably delay women's suffrage without stopping it. Historical wartime service strengthened the political case for women, while the existing residence and property franchise threatened to exclude men who had spent years at the front. Parliament had to address both problems when it rewrote voting qualifications. Removing prolonged mobilization reduces this social and administrative pressure while leaving the prewar suffrage movement intact.