it takes time and trust that bitcoin is recognized by a state. many governments still fear in legalizing bitcoin. the only way is to use bitcoin as often as possible. So the government should not have to recognize bitcoin for a functioning economic system in the country.
for now, the government is very scared with bitcoin, because they think bitcoin currency is illegal and assist the process of crime such as money laundering and so on. maybe in the future the government can accept bitcoin under certain conditions
The only way us to develop it so much so that the governments will be able to tax the people with it. Anything either than taxation and prevention of money laundering will not sink down well for them.
Money laundering is not the main issue when it comes to the Government's disdain for Bitcoin. The government probably already has ways of detecting large amounts of money being laundered through Bitcoin.
Governments will not accept Bitcoin as it exists. They'll only accept it if Bitcoin abandons the things that made people chose to use it in the first place. And the government would not accept a form of money that they can't manipulate, like they're doing now with fiat money; They can print money on demand with fiat money, but if they accept Bitcoin as it is, (and Bitcoin becomes a major form of payment among people and businesses) that would mean the government can't increase the supply of money whenever it wants. They would only accept Bitcoin if it would become something like government-issued digital money. And in that case, most people would not use it.
And the tax issue. Many people are looking for ways to not pay income taxes for philosophical reasons; They're opposed to the idea of there being an income tax. They don't want the government to be spending money and accumulating debt (which can only happen if there's an income tax). During a certain portion of the 19th century there was no income tax, and during that time America had the largest economic growth in the history of the world.