It is an enormous danger to any nation state. If you dont control the currency, you dont control the country.
Well, people will need to pay tax with the countrys currency.
So there will be a need and use of that countrys currency and I dont think citizens of a country would want to totally get rid of their own currency.
Its also an opportunity for any country. Like the internet. Creating jobs and getting millions in money.
The countries first to adopt new technology will earn most on it.
In fact if I where a government I would like my citizens to hold highest amount of Bitcoins possible as it might be the currency of the future on internet. It can be regulated by random inspections.
Though .com, .net, .org should be avoided at all cost.
They can be pulled away.
I´m not sure they will bother that much right now either.
Bitcoin needs to grow to $150 to be more than a tiny tiny problem.
Its so small it would be allmost embarrasing right now for them to care.
Thats what I think, but I might be wrong. They might not have to much to do.
Though in reality Bitcoin benefits every single human in the world. Except the 100 bankers who own the majority in the big banks.