Yes, all governments and also the US EU Venezuela Etc,. would love to band all cryptocurrencies and to continue stilling and robbing the people using their fiat currency.
BUT

1. TIMES HAS CHANGED
   I bet you, in the 90's the post offices would love to band the E-mails and say/decide that they are illegal - because they were losing a lot of business

2. THE BITCOIN IS UNSTOPPABLE!!!!
   In order to stop the bitcoin - governments would have to or switch off the electricity or turn off the Internet.
   => as long as there is Internet - there will be bitcoins and people trading bitcoins - legal or not legal it does not mater

Even the Chinese Government wanted to stop it but the people would still buy crypto currencies and they came to a conclusion that instead of fighting a war that you cannot win -they better regulate the cryptocurrencies - and they did / do.