I don't think there will be a complete ban on Bitcoin in any country of the world because in such there Bitcoin will be more active under cover which will put the economy in the trouble so the best way to legalize it and use it for the betterment of the economy. No country can ban the use of the Bitcoin, they can just ban the legal conversion of Bitcoin to fiat currencies.
Maybe we can still see some who are using it but most likely those users are using bitcoin for illegal activities because they are not afraid of the law anymore as in the first place that is their job to do illegal things.