I think that governments are afraid of Bitcoin. The main reason for this is the lack of centralized control over the processes. Governments are used to controlling fiat currencies, that`s why they don`t know, what to do with Bitcoin. Most governments have a choice: to legalize or ban Bitcoin. This decision determines the further influence of Bitcoin on the state.
governments would have no choice but to completely legalize Bitcoin in the future. Just my thoughts 
If a government truly wants an independent growth of economy, true welfare of the society (which it ideally should) then they should have no problem in accepting decentralized economic models like bitcoins. As of now, the people on power are used to holding their power to keep the rest of the population in check.
A liberal and open-minded rule would accept decentralization but a greedy and power hungry organizations would never.
Even if bitcoin gets banned, it would never die out, freedom and anonymity never dies.