We haven't had an attempt to stop bitcoin, and in my opinion, we won't see one.
Governments taking precautions and evaluating measures in the form of regulations or likely only temporary distance are not inherently aggressive maneuvers. Not sure why they're seen in that light.
It has the potential of becoming heavily adopted internationally, and can be of great benefit to many individual nation states. It is in the best interests of any one country then, especially the powerful, to not make a detrimental long-term negative move. In the same light, a similar positive move may be a bit premature. If all the powerful governments could figure out a way to band together and put up a economical wall against the nation states who have every incentive to adopt bitcoin, then perhaps they would do so. Unfortunately, that is not at all realistic or likely, not only because said countries are battling for supremacy against each other, but also given the intense rate of adoption.
So in that light, no, there's nothing governments can do. They can play along, not play along and turn a blind eye, or not play along and expend policing on an inevitable underground market.
The people have spoken, many countries, understandably, are hugely in favor of it. The fact that the powerful are so bent on power is part of bitcoins anti-fragility. If the powerful don't want to experience even a slight tip in the scales, which they won't, then they simply have to find a way to mesh the old with the new.
And that wraps up this thread.