India may or may not lose in any case I don't think that will be any significant at all but look at yourself, your boundaries, your location, surroundings Bangladesh will only play a losing game by annoying its big and much powerful neighbor..
Here an armchair general of India is talking about our vincibility because BD is a small country surrounded by a big India. So, I ask you to look at your NE. A 20km stretch of mountain stretch called Chicken Neck (CN) has made Indian NE vulnerable in case of a war with China. You will be living on our mercy at this point because without a good amount of mercy India gets divided into two.