Turn the internet off, That will definitely stop all the transaction of Bitcoin and any other cryptocurrency. Since the Bitcoin solely relies on the internet. The government can't stop the spread of Bitcoin they could regulate some laws in regards the transactions but to totally ban it? They don't have that power to do so.
It's not possible for bitcoin to die but let's suppose how it might happen.
-If the miners somehow stop mining.
-If someone hacks into the bitcoin network.
There are many others ways but these are enough for this topic
First, Why will the miners stop mining? If they are generating money from it.
Second, How can a hacker hack into the network if no one knows who and where the main source of Bitcoin?