Bitcoin and other cryptocurrency are not banned in India. They are declared as not a legal tender as per RBI. Gold and Silver also do not have a legal tender in India that does not mean they are banned.
Coming to the Future of Bitcoin and Cryptocurrency, there are thousands of way to cash out the money invested and no matter what measures the Government take you can easily buy, sell and trade in btc.
Other such options : You can invest in Shares and Mutual funds in india via demat account if you want to follow the RBI guidelines.