You can tell me anything what's bitcoin worst enemy is...
Mine is, government!
Bankers are the real threat, bitcoin in itself is not a threat to any government, the threat of bitcoin is against banks and their interests, so it makes sense they are the ones that are going to make the greatest efforts to stop bitcoin, they have tried to stop bitcoin adoption by canceling the accounts of some exchanges but it seems they are going to use their greatest puppets, the media and governments.
that is not true, i heard that there are several banks in different countries who are ready to adopt the system from bitcoin or receive bitcoin as an option, I do not see banks putting a threat on bitcoin, even I doubt some of the central bank officials know about bitcoin lol. for now it seems the only threat is from governments that are reluctant to legalize bitcoin