IF there is a full scale war between India and ChinaAll were hypothetical yet.. if there were a full scale war between India and China which will bring in Pakistan into picture as well. In that pequliar scenario ofcourse Bangladesh's decision to take side will be great deal to India. If BD supporst China than its not BD but India will be surrounded. I presume China will put a knock out blow to its Chicken neck and separate India from its eastern wing. Then with China-BD force along with all those tribes will backed by Chinese air power will be a formidable force to take over Calcutta in no time. Also there will be a big push from south china sea to the Bay of Bengal and I presume Andaman will be under Chinese Control in no time with Myanmarese supplying logistics..
Mannnnn .. i cant think of anymore.... India is doomed.
1)Armour is useless
2)PLAN won't engage in IOR nor IN will engage in South-china sea
3)All the neighbours port in South Asia will be wrecked off so no trade will happen
4)IN will be patrolling near Molacca (Myanmar helping China is a no goner since they are compelled to be neutral)
(So is Sri Lanka)
5)The Indian airspace will be blocked so no air transport to BD
6)No army on earth can send armour or artillery across the Himalayas(they are the worlds greatest geographical barrier)
7)The Chinese LoCs will be strecthed across Tibet a blunder since its through a sort of hostile territory
8)It will be a missile war
9)Pakistans collar will not be released by US
CASE 1:
In case of a friendly regime in BD we will be using BD territory for transit supplies neutrality will not be an option
CASE2:
In case of Khaleda Zia the entire infrastructure of BD except railways will be rendered useless and you will be forced to negotiate