1971 partition was more because of unfair political attitude of Pakistan against Bangladesh than Indo-Pak war. No partition would ever have taken place if Pakistan had treated Bangladesh fairly, infact a united Pakistan would have atleast guaranteed a status pro quo, if not exceed on achievements of 1965.
Things could also have been different if the Indian Prime Minister, at that time, had informed his/her Pakistani counterpart about the seperatist movement leaders/activists/members/supporters details and perhaps Pakistan too would have wiped out the opposition in a single day...........something like the list that Benazir bhutto gave to Rajiv Gandhi containing details, names, addresses etc. of people involved in Khalistan Movement. You guys do remember Khalistan Movement, don't you!