Yes, the government can prohibit cryptocurrency. It's in his jurisdiction. We can only hope that it will be wise and do not go so
I think although bitcoin is prohibited even if it will not give a big effect on bitcoin, even now many governments prohibit the use bitcoin, but it did not leave much of an negative effect
I don't even think that even will prohibit the usage of bitcoin. Still us who uses bitcoin will not stop in using and since it is online we can just simply hide our identities to our cyber crime watch. And this will be the future money of the cyber people in the cyber world. Not an easy thing for the government but they might adopt it as second currency.