Modi like every other politician, is a politician first then everything ( Patriot, Hinduvadi etc).
Even if Modi wants to act will the 300 million Indian Muslim who don't care about national interest, let him do so.They oppose an uniform civil code. They opposing removing haj subsidy. They oppose demolishing illegal Mosques (70% of mosques are built illegaly in India). So I guess no.
He will just focus on development and forget national issues and few years after he dies it will be a same story in India like it was during partition.
Personally speaking people of North-East particulary Assam have suffered a lot due to Bangladeshis. Being with India is doing them no good since Muslim votes( even Bangladeshi ones) are too precious for our Politicians.