It's not a threat to Bitcoin at all -- Bitcoin can only grow stronger for every instance of centralised money that is created and continues to come up short. Every failure of the centralised and the state, is a victory for Bitcoin. Threat to other centralised altcoins? Oh for sure.
Opportunity? Why not? Every government that realises it is creating yet another centralised currency - just more transparent and more under their control, might like blockchain and in that sense recognises Bitcoin tech as valid.
The one thing that worries me is the fact that governments may impose restrictive regulation on top of issuing their own cryptocoins, in order to preserve the status of their centralized money as the only "legal tender" or legal currency at the very least in their own jurisdiction.
That will be detrimental for bitcoin and other decentralized currencies, no doubt.
But even then, there is really no way of enforcing these bans and censoring the network entirely - which is one of the beauties of the BTC network in the first place.
It is worrying, but take a look at it from a point of invention, which is driven by necessity.
Bitcoin was birthed from a necessity to remove money from the hands of the few. And while a lot of people believe recognition and acceptance by states is good for Bitcoin (it is, of course), Bitcoin doesn't need that.
If anything, Bitcoin was built to resist all these forms. People may not have realised it then, but now with everything going on with fiat and with governments blocking freedoms and censorship, people finally get it. And Bitcoin will continue to improve and evolve to resist that.