it may have thousands of implications, like ANP or jiye sindh riting it, second possibility maybe, it implies karachi city is over populated and enough is enough let it remain on the hands of karachites, dont settle here to increase the crises of over population.
if the population of karachi keeps increasing like this, karachi as you say will be like a ghetto, a lower life style, due to lack of water and electricity it is hard now to facilitate the present karachites let alone the immigrants.
due to pathan mafia, karachi has already declined as an industrial city, karachi will be like kolkata..