You don't understand.
Get our of your narrow nationalist mind. Just because you were born in Pakistan does not necessarily make you a Pakistani. There are Pakistanis outside Pakistan as well. Think about the humanitarian angle as well. Pakistan is blessed with a lot of land and the population density remains one of the lower ones in Asia. Another 5 to 10 crore will not break the bank. Plus, you will get a more literate and educated group as well, as per Census.
In India if they continue their separatism, they will get their land on the other side of Life. Non Muslims are no longer naive and the next Direct Action Day may well be initiated by this side.
Please think about human lives and spread awareness. Pakistan and BD should take responsibility for those who wish to go there. At least they should declare this intent publicly.