I don't think INDIA will ban BTC. Modi is a cleaver man,  he knows it is important to adopt new and trending technology to match the world development speed.  Moreover INDIA follow USA in terms of technology development and to get outsourced work. BTC being an easy and cheaper mode of international transaction(ie transaction around the globe), therefore it is used to get paid for outsourced work in India. So no govt.  Want to loose their foreign business,  so banning BTC seems to difficult at this point of time.