As the present condition of the world i think most of the government will approve bitcoin because we know that there are several Institutions or organizations already invest in this platform and many economic organization already involved in this platform due to expend their business as well as to survive. If the government will not support then those organization will not involved in this platform as well. So i think they have to give the permission for their existence.
The approval and legalization of bitcoin and other cryptocurrencies is one thing. And support for the development of cryptocurrency is completely different. Many states have already legalized cryptocurrency, that is, established its legal status, conditions and procedure for its circulation in society. However, no state has ever supported and will not support a decentralized cryptocurrency, that is, it will not create preferential conditions and infrastructure for its circulation.
States are only using blockchain technology to create their national central bank stablecoins. The states, most likely, by means of legal regulation will try to oust cryptocurrency from circulation. Let's see how they succeed.