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
That wouldn't be an end but it will certainly hit hard
The prices would likely go down dramatically if they would mean anything at all since most if not all exchanges will be closed down or denied access to (by the Greater World Firewall). Internet seems to be the weakest link where governments will likely hit first. Indeed, there is DarkWeb and things like Tor, but how many users would be using them? In other words, we would quick get back to the 10k bitcoins for a pizza times. Obviously, this is a doom and gloom scenario, and the longer Bitcoin exists the lesser are the chances for it to come true, but we still shouldn't write it off completely