It probably can't be killed but what can happen is that if enough major countries try to completely ban it then the value will literally go right into the toilet bowl and stay there permanently.
It might still be around but you're risking legal problems if you use it, mine it, or trade it. And it will never be worth much at that point.
If the US and Europe follow along with the jerks in China then the market value will probably fall right through the basement floor and keep going.