Make bitcoin not being legalized at some countries just will opend the black market with people making fortunes into bitcoin ,the same way as happens at dollars at Argentina the goverment tryed to control but the outside market reacted on the same moment.
Argentina does not represent the typical government, but yes, it does show that a government's efforts at limiting bitcoin will fail.
Banning bitcoin will just really result in fail as the government cant really track their citizens constantly and people wont even allow that they are being tracked.