I really don't understand whats wrong with RBI. Why are we the last ones to welcome innovations and technology. Why are we so skeptical to change. Fiat has been here since long and needs a change.
A change will churn the system and bring all the black money to the table. And set proper systems to not generate any more black money.
Anonymity of Cryptos sure sounds like a problem but banning them is definitely not the solution.
If you can't think of a solution then at least wait for the giants like USA and UK take a stand. And then just follow their footsteps like we have been doing all time.