Bangladesh might not like Pakistani rule, but that does not mean they like Hindu India any better. I think the separation of Pakistan and Bangladesh is actually good in the long run and the fact remains, both are staunch Muslims and both hate India. China is already planning to prop up Chittagong as the next pearl.
I've said it earlier, disintegration of India is inevitable and we should work to make it as peaceful as possible. India is an artificial country and has an image of a pariah state in the region, it has no future whatsoever.