Cannot predict the future but I guess, it will take few decades to reach the condition that RBI is going to accept the bitcoin because in recent days RBI issued a notice that he is not responsible for any loses regarding bitcoin. I guess, the people are still not aware of the potential of the bitcoin and they still ignoring because it is not yet centralized. Awareness need to be created among people so that they know about bitcoin and could see the advantages of BTC. It will take time, but I am sure for one thing that one time in the future, RRI will surely accept bitcoins.