if all the governments of all the world joint hands together to banned bitcoins ,then only would bitcoin can come to an end.otherwise it is not gonna happen no where soon. because of its decentralization and no technology could beat because it is the first of its kind.
Even if Bitcoin is banned by every nation, Bitcoin will continue to exist. One example is, why crime still exist when it is actually banned and illegal in all corners of the world? Because there is always someone who is doing it, breaking the laws and commit crime. Bitcoin, mining and running node for it is not a different thing once Bitcoin is banned by all nation.
The only time Bitcoin die is when the network stop producing blocks and that goes to the miner. If no one mines bitcoin then the network will die.