Mumbai is what only because of north indians, there is no marathi big businessman, all major business of indis is run by north indians ie Birlas, bajajs, Sunil Mittal, Oberoys,etc
North has built film industry in mumbai, 95% of production houses, actors, directors, script writers are from north, if north indians leave mumbai it will become like vidarbha
North indians have built mumbai and now they have developed NCR which is rivalling and will soon take over mumbai