Well Pranab has agreed to remove trade barrier for Pakistan, so it would be much easier for removing it for Bangaldesh. Also India already grants MFN to dhaka I believe , correct me if i am wrong. Treaties etc are handled by politicians who are driven mostly by their own interest. Just like you mentioned of politicians in bangladehs. So for that u can not feel bad about india. This contradicting issues or irritants can be dealt by Govt. in mutual harmony. Believe me for bangladesh and india to resolve all this would be lot easier than some other SARC countries
