Speculation is after all speculation, but unless the government offer an improvement on Bitcoin then why would this be a threat to Bitcoin? If it's improved on Bitcoin then why would we be hostile to this crypocurrency? If the government came out with an improved cryptocurrency which was open source and decentralized then I for one welcome the change. Would probably change my mind of the way governments think if they actually did this. If it's not decentralized or open source then it should fail.

How can they kill Bitcoin "easily", why haven't they done it already if this was indeed the case? Bitcoin is decentralized and has a format to prevent any manipulation from a central figure. Only certain aspects of mining is somewhat centralized.  Trust me if it was so easy to 'kill' Bitcoin then it would of likely been done already. I mean it's had several attempts on it, but as of today all have failed.

The government may limit the development of Bitcoin, but believe that the government cannot stop Bitcoin. The development of Bitcoin itself is not controlled by any organization.

If government kill and stop bitcoin operation, it is something a war between government and bitcoin, because many people against government decisions if they try to kill bitcoin operation. And we all know that government has the power to kill bitcoin operation, and hopelly government would not be able to do that kind of actions.

Yes this is possible if the world government take their actions to totally banned bitcoin because they want to create their own crypto currency and monitor who is the holder of the currency they are making today. this will definitely kill bitcoin.

Bitcoin already sets the framework or the foundation in crypto currency so no matter what policies the government will make to kill bitcoin, it will always be based on bitcoin.

As what others said bitcoin can't be removed/killed. Some countries already banned bitcoin but the demand is still high and even if it's banned in all countries there's no stopping people in using bitcoin. Maybe if they could make a better version of bitcoin without the need of the internet but I highly doubt that such thing could happen because it would take a lot of time before any newly made crypto could compete with other altcoin and eventually take out bitcoin from its current position.

No, bitcoin is international currency. Its advantage is the decentralization, those governments will only bring more positive impact for bitcoin. Indirectly those governments are agree that bitcoin is good technology or atleast the idea of digital currency is appropriate for this century.

Yes, they can kill bitcoin if we do nothing and the reason is that they want a centraized coin which the reason why they are watching bitcoin closely and this why most of them says that bitcoin help money laundering, tax evasion and terrorist funding