Today, some countries have banned bitcoin for various reasons. they do that to prevent the bad impact of bitcoin to the country or their citizens. there are also many rumors or discourses that many governments in Asia become aware with bitcoin and try to suggest their citizens to don't invest their money in bitcoin. i think it is a sign that they don't prefer bitcoin. Maybe they feel that bitcoin will give bad affect to their economic state
No all countries are trying to against bitcoin nowadays, but how if all countries will ban bitcoin usage and bitcoin trade in the future?
how can bitcoin users do? will they do illegal action by keep using bitcoin or give other solutions?
If ever Bitcoin and other cryptocurrency gets banned worldwide and is treated as illegal then that's it, Bitcoin is illegal. Bitcoin users could file petitions to their government if applicable. People can exercise their rights about this matter. However, Bitcoin will stay illegal unless revoked by the government. Bitcoin users could still use Bitcoin but illegally.
You have very good point that we as bitcoin users have a chance to send a petition to the government. we also can do conducive demonstration with some nice argumentations and huge mass.