If all Biharis, Gujaratis, South Indians etc etc move out of Mumbai...you local people will be in Permanent SHIT.. Imagine the amount of business that takes place just because of one Amitabh Bachchan(or any of the popular actors): Poster sellers, audio CD manufacturers & sellers.. singers, event management houses, radio, acting schools etc etc..Their business thrives on some actor becoming a star. So please leave this MUMBAI arrogance behind u..