Is this real, West Bengal population is around 9 crores. 1947, 1971 and there after loads of people coming from East Bengal. Their count with the descendents must be more than 60%.I have met a few original Bengali from west Bengal. They do not care about Bangladesh, they look west towards Delhi. Even the Muslims also do not care about BD. On the contrary, I have met others from west Bengal whose forefathers migrated to India. They do neither identify themselves with India nor with west Bengal. They identify as from Bangladesh with Indian Passport. They lament for leaving their country, Bangladesh. I have seen them getting angry when someone insists on them as Indian.
Anyway, this is my personal experience. Things may differ from man to man.
Never ever in my life I saw them calling themselves Bangladeshis. They boast about their BD lineage and how rich their forefathers were. They have a not so good picture of BD because of the trauma their forefathers faced when they left their land and termed as refugees in West Bengal.